Bs_3643 Iso Metric Screw Thread Part2.pdf 4011c

BRITISH STANDARD

BS 3643-2: 1981 (Reprinted, incorporating Amendment No. 1)

ISO metric screw threads —

Licensed copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, © BSI

Part 2: Specification for selected limits of size

UDC 621.882.082.1:621.753.1/.2

BS 3643-2:1981

Cooperating organizations The Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consist of representatives from the following: Associated Offices Technical Committee Association of Consulting Engineers Association of Hydraulic Equipment Manufacturers Association of Mining Electrical and Mechanical Engineers

Wales Engineering Equipment s’ Association Federation of Manufacturers of Construction

British Compressed Air Society British Electrical and Allied Manufacturers’ Association (BEAMA)*


Department of Trade (Marine Division) Department of Transport Electricity supply Industry in England and

Equipment and Cranes Health and Safety Executive Institution of Gas Engineers

British Gas Corporation British Gear Manufacturer’ Association British Internal Combustion Engine Manufacturers’ Association* British Pump Manufacturers’ Association British Steel corporation

Institution of Plant Engineers Institution of Production Engineers

British Steel Industry British Valve Manufactures’ Association Ltd. Cbmpe Chartered Institution of Building Services Crown Agents for Oversea Governments and istrations Department of the Environment (PSA) Department of Industry (National Engineering Laboratory)

National Coal Board* Oil Companies Materials Association Process Plant Association Railway Industry Association of Great Britain* Society of Motor Manufacturers and Traders Limited Telecommunication Engineering and Manufacturing Association (TEMA)*

Lloyd’s of Shipping London Transport Executive Machine Tool Industry Research Association Ministry of Defence*

The Organization marked with an asterisk in the above list, together with the following, were directly represented on this Technical Committee entrusted with the presentation of this British Standard: Agricultural Engineers’ Association Bicycle Association of Great Britain British Industrial Fasteners Federation British Railways Board Business Equipment Trade Association

Gauge and Tool Makers’ Association Screw Thread Tool Manufacturers’ Association Society of British Aerospace Companies Limited Individual manufacturer

Fasteners and Turned Parts Institute

This British Standard, having been prepared under the direction of the Mechanical Engineering Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 December 1981 © BSI 12-1998 First published June 1965 First revision December 1966 Second revision December 1981 ISBN 0 580 12412 6

Amendments issued since publication Amd. No

Date of issue

Comments

5094

June 1986

Indicated by a sideline in the margin

BS 3643-2:1981

Contents Cooperating organizations Foreword 1 2 3

Page Inside front cover ii

Scope References Designation

1 1 1

Appendix A Additional tolerance classes for aerospace use

38

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement Table 2 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement for aerospace use


Publications referred to

© BSI 12-1998

2 39

Inside back cover

i

BS 3643-2:1981


Foreword This British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee. It supersedes BS 3643-2:1966 and BS 3643-3:1967, which are therefore withdrawn. BS 3643-1 contains details of the basic thread profile, general plan of standard diameter/pitch combinations, basic thread dimensions, tolerance principles and basic data from the latest ISO metric screw thread standards. The previous edition of BS 3643-2 specified the limits and tolerances for coarse pitch series threads in the range 1 mm to 68 mm diameter. The previous edition of BS 3643-3 specified the limits and tolerances for fine (constant) pitch threads in the range 1 mm to 300 mm diameter. In both Parts 2 and 3, three classes of fit were given, “close”, “medium” and “free”, the respective nut/bolt tolerance classes being 5H/4h, 6H/6g and 7H/8g. The same tolerance classes have been used as the basis for this standard but in addition the tolerance class 4H is specified for pitches up to and including 0.45 mm to align with Part 1. The selection of nut/bolt tolerance classes rests with the designer, based on the information given in Part 1. This edition of Part 2 combines the information previously given in both Parts 2 and 3, and is set out in a single table so as to present designers and s with the limits and tolerances for ISO metric threads in the most convenient form. For further detailed information see BS 3643-1. Pending the publication of a British Standard on coated threads, which will be based on ISO/DIS 4042, BS 3382 should be consulted for guidance. A British Standard does not purport to include all the necessary provisions of a contract. s of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 40, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. ii

© BSI 12-1998


BS 3643-2:1981

1 Scope

3 Designation

This Part of this British Standard specifies the fundamental deviations, tolerances and limits of size for the tolerance classes 4H, 5H, 6H and 7H for internal threads (nuts) and 4h, 6g and 8g for external threads (bolts) where appropriate for: coarse pitch series within the range 1 mm to 68 mm diameter; fine pitch series within the range 1 mm to 33 mm diameter; constant pitch series within the range 8 mm to 300 mm diameter. For certain diameter/pitch combinations tolerance class 4H for internal threads and tolerance classes 6h and 4g for external threads have been included in appendix A primarily for aerospace use.

The complete designation for a screw thread shall comprise a designation for the thread system and a designation for the thread tolerance class (see 4.3 and 6.4 of BS 3643-1:1981). Examples:

NOTE Attention is drawn to the fact that, with the different screw thread forms available, there is the possibility of mismatch. It is the responsibility of the designer of the end product to ensure that this possibility is reduced to a minimum. For further information see PD 6494.

2 References The titles of the standards publications referred to in this standard are listed on the inside back cover.

© BSI 12-1998

1

All dimensions are in millimetres. 1 Nominal diameter

2

3

4

5

6

Pitch

7

8

Coarse Fine constant Tolerance Fund class dev.

1

0.2 0.25 0.2

1.1

0.25 0.2

1.2

0.25 0.2

1.4 0.3 0.2 1.6

0.35

9

10

11

12

13

14

15

External threads (bolts) Major diameter max.

© BSI 12-1998


NOTE For the minor diameter of external threads this table specifies the minimum dimensions only. The maximum dimensions have not been specified based on the requirement of 6.10 of BS 3643-1:1981 that these dimensions are controlled by the GO gauge.

tol.

min.

17

18

19

20

21

22

Internal threads (nuts)

Pitch diameter max.

16

tol.

min.

Minor Tolerance Fund Major diameter class dev. diameter min.

min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g

0 0.017

1.000 0.036 0.983 0.056

0.964 0.927

0.870 0.030 0.853 0.048

0.840 0.805

0.717 0.682

4H

0

1.000

0.910 0.040

0.870

0.821 0.038

0.783

4h 6g

0 0.018

1.000 0.042 0.982 0.067

0.958 0.915

0.838 0.034 0.820 0.053

0.804 0.767

0.649 0.613

4H 5H

0 0

1.000 1.000

0.883 0.045 0.894 0.056

0.838 0.838

0.774 0.045 0.785 0.056

0.729 0.729

4h 6g

0 0.017

1.100 0.036 1.083 0.056

1.064 1.027

0.970 0.030 0.953 0.048

0.940 0.905

0.817 0.782

4H

0

1.100

1.010 0.040

0.970

0.921 0.038

0.883

4h 6g

0 0.018

1.100 0.042 1.082 0.067

1.058 1.015

0.938 0.034 0.920 0.053

0.904 0.867

0.750 0.713

4H 5H

0 0

1.100 1.100

0.983 0.045 0.994 0.056

0.938 0.938

0.874 0.045 0.885 0.056

0.829 0.829

4h 6g

0 0.017

1.200 0.036 1.183 0.056

1.164 1.127

1.070 0.030 1.053 0.048

1.040 1.005

0.917 0.882

4H

0

1.200

1.110 0.040

1.070

1.021 0.038

0.983

4h 6g

0 0.018

1.200 0.042 1.182 0.067

1.158 1.115

1.038 0.034 1.020 0.053

1.004 0.967

0.850 0.813

4H 5H

0 0

1.200 1.200

1.083 0.045 1.094 0.056

1.038 1.038

0.974 0.045 0.985 0.056

0.929 0.929

4h 6g

0 0.017

1.400 0.036 1.383 0.056

1.364 1.327

1.270 0.030 1.253 0.048

1.240 1.205

1.117 1.082

4H

0

1.400

1.310 0.040

1.270

1.221 0.038

1.183

4h 6g

0 0.018

1.400 0.048 1.382 0.075

1.352 1.307

1.205 0.036 1.187 0.056

1.169 1.131

0.984 0.946

4H 5H 6H

0 0 0

1.400 1.400 1.400

1.253 0.048 1.265 0.060 1.280 0.075

1.205 1.205 1.205

1.128 0.053 1.142 0.067 1.160 0.085

1.075 1.075 1.075

4h 6g

0 0.017

1.600 0.036 1.583 0.056

1.564 1.527

1.470 0.032 1.453 0.050

1.438 1.403

1.315 1.280

4H

0

1.600

1.512 0.042

1.470

1.421 0.038

1.383

4h 6g

0 0.019

1.600 0.053 1.581 0.085

1.547 1.496

1.373 0.040 1.354 0.063

1.333 1.291

1.117 1.075

4H 5H 6H

0 0 0

1.600 1.600 1.600

1.426 0.053 1.440 0.067 1.458 0.085

1.373 1.373 1.373

1.284 0.063 1.301 0.080 1.321 0.100

1.221 1.221 1.221

BS 3643-2:1981

2

Table 1 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement


2

3

4

5

6

Pitch

1.8 0.35 0.25 2 0.4 0.25 2.2 0.45

0.35 2.5 0.45 0.35 3 0.5

7

8

9

10

11

12

13

14

15

External threads (bolts)


0.2

17

18

19

20

21

22


Major diameter

Pitch diameter

max.

min.

max.

tol.

16

tol.

min.


min.

Pitch diameter max.

tol.

Minor diameter

min.

max.

tol.

min.

4h 6g

0 0.017

1.800 0.036 1.783 0.056

1.764 1.727

1.670 0.032 1.653 0.050

1.638 1.603

1.515 1.480

4H

0

1.800

1.712 0.042

1.670

1.621 0.038

1.583

4h 6g

0 0.019

1.800 0.053 1.781 0.085

1.747 1.696

1.573 0.040 1.554 0.063

1.533 1.491

1.317 1.275

4H 5H 6H

0 0 0

1.800 1.800 1.800

1.626 0.053 1.640 0.067 1.658 0.085

1.573 1.573 1.573

1.484 0.063 1.501 0.080 1.521 0.100

1.421 1.421 1.421

4h 6g

0 0.018

2.000 0.042 1.982 0.067

1.958 1.915

1.838 0.036 1.820 0.056

1.802 1.764

1.648 1.610

4H 5H

0 0

2.000 2.000

1.886 0.048 1.898 0.060

1.838 1.838

1.774 0.045 1.785 0.056

1.729 1.729

4h 6g

0 0.019

2.000 0.060 1.981 0.095

1.940 1.886

1.740 0.042 1.721 0.067

1.698 1.654

1.452 1.408

4H 5H 6H

0 0 0

2.000 2.000 2.000

1.796 0.056 1.811 0.071 1.830 0.090

1.740 1.740 1.740

1.638 0.071 1.657 0.090 1.679 0.112

1.567 1.567 1.567

4h 6g

0 0.018

2.200 0.042 2.182 0.067

2.158 2.115

2.038 0.036 2.020 0.056

2.002 1.964

1.848 1.810

4H 5H

0 0

2.200 2.200

2.086 0.048 2.098 0.060

2.038 2.038

1.974 0.045 1.985 0.056

1.929 1.929

4h 6g

0 0.020

2.200 0.063 2.180 0.100

2.137 2.080

1.908 0.045 1.888 0.071

1.863 1.817

1.585 1.539

4H 5H 6H

0 0 0

2.200 2.200 2.200

1.968 0.060 1.983 0.075 2.003 0.095

1.908 1.908 1.908

1.793 0.080 1.813 0.100 1.838 0.125

1.713 1.713 1.713

4h 6g

0 0.019

2.500 0.053 2.481 0.085

2.447 2.396

2.273 0.040 2.254 0.063

2.233 2.191

2.017 1.975

4H 5H 6H

0 0 0

2.500 2.500 2.500

2.326 0.053 2.340 0.067 2.358 0.085

2.273 2.273 2.273

2.184 0.063 2.201 0.080 2.221 0.100

2.121 2.121 2.121

4h 6g

0 0.020

2.500 0.063 2.480 0.100

2.437 2.380

2.208 0.045 2.188 0.071

2.163 2.117

1.885 1.839

4H 5H 6H

0 0 0

2.500 2.500 2.500

2.268 0.060 2.283 0.075 2.303 0.095

2.208 2.208 2.208

2.093 0.080 2.113 0.100 2.138 0.125

2.013 2.013 2.013

4h 6g

0 0.019

3.000 0.053 2.981 0.085

2.947 2.896

2.773 0.042 2.754 0.067

2.731 2.687

2.515 2.471

4H 5H 6H

0 0 0

3.000 3.000 3.000

2.829 0.056 2.844 0.071 2.863 0.090

2.773 2.773 2.773

2.684 0.063 2.701 0.080 2.721 0.100

2.621 2.621 2.621

4h 6g

0 0.020

3.000 0.067 2.980 0.106

2.933 2.874

2.675 0.048 2.655 0.075

2.627 2.580

2.319 2.272

5H 6H 7H

0 0 0

3.000 3.000 3.000

2.755 0.080 2.775 0.100 2.800 0.125

2.675 2.675 2.675

2.571 0.112 2.599 0.140 2.639 0.180

2.459 2.459 2.459

BS 3643-2:1981

3


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


0.35 3.5 0.6

0.5 4 0.7

0.5 4.5 0.75

0.5 5 0.8 5.5

0.5

9

10

11

12

13

14

15


© BSI 12-1998


All dimensions are in millimetres.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

Minor diameter

min.

max.

tol.

min.

4h 6g

0 0.019

3.500 0.053 3.481 0.085

3.447 3.396

3.273 0.042 3.254 0.067

3.231 3.187

3.015 2.971

4H 5H 6H

0 0 0

3.500 3.500 3.500

3.329 0.056 3.344 0.071 3.363 0.090

3.273 3.273 3.273

3.184 0.063 3.201 0.080 3.221 0.100

3.121 3.121 3.121

4h 6g

0 0.021

3.500 0.080 3.479 0.125

3.420 3.354

3.110 0.053 3.089 0.085

3.057 3.004

2.688 2.635

5H 6H 7H

0 0 0

3.500 3.500 3.500

3.200 0.090 3.222 0.112 3.250 0.140

3.110 3.110 3.110

2.975 0.125 3.010 0.160 3.050 0.200

2.850 2.850 2.850

4h 6g

0 0.020

4.000 0.067 3.980 0.106

3.933 3.874

3.675 0.048 3.655 0.075

3.627 3.580

3.319 3.272

5H 6H 7H

0 0 0

4.000 4.000 4.000

3.755 0.080 3.775 0.100 3.800 0.125

3.675 3.675 3.675

3.571 0.112 3.599 0.140 3.639 0.180

3.459 3.459 3.459

4h 6g

0 0.022

4.000 0.090 3.978 0.140

3.910 3.838

3.545 0.056 3.523 0.090

3.489 3.433

3.058 3.002

5H 6H 7H

0 0 0

4.000 4.000 4.000

3.640 0.095 3.663 0.118 3.695 0.150

3.545 3.545 3.545

3.382 0.140 3.422 0.180 3.466 0.224

3.242 3.242 3.242

4h 6g

0 0.020

4.500 0.067 4.480 0.106

4.433 4.374

4.175 0.048 4.155 0.075

4.127 4.080

3.819 3.772

5H 6H 7H

0 0 0

4.500 4.500 4.500

4.255 0.080 4.275 0.100 4.300 0.125

4.175 4.175 4.175

4.071 0.112 4.099 0.140 4.139 0.180

3.959 3.959 3.959

4h 6g

0 0.022

4.500 0.090 4.478 0.140

4.410 4.338

4.013 0.056 3.991 0.090

3.957 3.901

3.495 3.439

5H 6H 7H

0 0 0

4.500 4.500 4.500

4.108 0.095 4.131 0.118 4.163 0.150

4.013 4.013 4.013

3.838 0.150 3.878 0.190 3.924 0.236

3.688 3.688 3.688

4h 6g

0 0.020

5.000 0.067 4.980 0.106

4.933 4.874

4.675 0.048 4.655 0.075

4.627 4.580

4.319 4.272

5H 6H 7H

0 0 0

5.000 5.000 5.000

4.755 0.080 4.775 0.100 4.800 0.125

4.675 4.675 4.675

4.571 0.112 4.599 0.140 4.639 0.180

4.459 4.459 4.459

4h 6g

0 0.024

5.000 0.095 4.976 0.150

4.905 4.826

4.480 0.060 4.456 0.095

4.420 4.361

3.927 3.868

5H 6H 7H

0 0 0

5.000 5.000 5.000

4.580 0.100 4.605 0.125 4.640 0.160

4.480 4.480 4.480

4.294 0.160 4.334 0.200 4.384 0.250

4.134 4.134 4.134

4h 6g

0 0.020

5.500 0.067 5.480 0.106

5.433 5.374

5.175 0.048 5.155 0.075

5.127 5.080

4.819 4.772

5H 6H 7H

0 0 0

5.500 5.500 5.500

5.255 0.080 5.275 0.100 5.300 0.125

5.175 5.175 5.175

5.071 0.112 5.099 0.140 5.139 0.180

4.959 4.959 4.959

BS 3643-2:1981

4



2

3

4

5

6

Pitch

7

8


0.75 6

1

0.75 7 1

0.75

1

8

1.25

0.75

9

1

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g

0 0.022

6.000 0.090 5.978 0.140

5.910 5.838

5.513 0.063 5.491 0.100

5.450 5.391

4.988 4.929

5H 6H 7H

0 0 0

6.000 6.000 6.000

5.619 0.106 5.645 0.132 5.683 0.170

5.513 5.513 5.513

5.338 0.150 5.378 0.190 5.424 0.236

5.188 5.188 5.188

4h 6g 8g

0 0.026 0.026

6.000 0.112 5.974 0.180 5.974 0.280

5.888 5.794 5.694

5.350 0.071 5.324 0.112 5.324 0.180

5.279 5.212 5.144

4.663 4.597 4.528

5H 6H 7H

0 0 0

6.000 6.000 6.000

5.468 0.118 5.500 0.150 5.540 0.190

5.350 5.350 5.350

5.107 0.190 5.153 0.236 5.217 0.300

4.917 4.917 4.917

4h 6g

0 0.022

7.000 0.090 6.978 0.140

6.910 6.838

6.513 0.063 6.491 0.100

6.450 6.391

5.988 5.929

5H 6H 7H

0 0 0

7.000 7.000 7.000

6.619 0.106 6.645 0.132 6.683 0.170

6.513 6.513 6.513

6.338 0.150 6.378 0.190 6.424 0.236

6.188 6.188 6.188

4h 6g 8g

0 0.026 0.026

7.000 0.112 6.974 0.180 6.974 0.280

6.888 6.794 6.694

6.350 0.071 6.324 0.112 6.324 0.180

6.279 6.212 6.144

5.663 5.596 5.528

5H 6H 7H

0 0 0

7.000 7.000 7.000

6.468 0.118 6.500 0.150 6.540 0.190

6.350 6.350 6.350

6.107 0.190 6.153 0.236 6.217 0.300

5.917 5.917 5.917

4h 6g

0 0.022

8.000 0.090 7.978 0.140

7.910 7.838

7.513 0.063 7.491 0.100

7.450 7.391

6.988 6.929

5H 6H 7H

0 0 0

8.000 8.000 8.000

7.619 0.106 7.645 0.132 7.683 0.170

7.513 7.513 7.513

7.338 0.150 7.378 0.190 7.424 0.236

7.188 7.188 7.188

4h 6g 8g

0 0.026 0.026

8.000 0.112 7.974 0.180 7.974 0.280

7.888 7.794 7.694

7.350 0.071 7.324 0.112 7.324 0.180

7.279 7.212 7.144

6.663 6.596 6.528

5H 6H 7H

0 0 0

8.000 8.000 8.000

7.468 0.118 7.500 0.150 7.540 0.190

7.350 7.350 7.350

7.107 0.190 7.153 0.236 7.217 0.300

6.917 6.917 6.917

4h 6g 8g

0 0.028 0.028

8.000 0.132 7.972 0.212 7.972 0.335

7.868 7.760 7.637

7.188 0.075 7.160 0.118 7.160 0.190

7.113 7.042 6.970

6.343 6.272 6.200

5H 6H 7H

0 0 0

8.000 8.000 8.000

7.313 0.125 7.348 0.160 7.388 0.200

7.188 7.188 7.188

6.859 0.212 6.912 0.265 6.982 0.335

6.647 6.647 6.647

4h 6g

0 0.022

9.000 0.090 8.978 0.140

8.910 8.838

8.513 0.063 8.491 0.100

8.450 8.391

7.988 7.929

5H 6H 7H

0 0 0

9.000 9.000 9.000

8.619 0.106 8.645 0.132 8.683 0.170

8.513 8.513 8.513

8.338 0.150 8.378 0.190 8.424 0.236

8.188 8.188 8.188

4h 6g 8g

0 0.026 0.026

9.000 0.112 8.974 0.180 8.974 0.280

8.888 8.794 8.694

8.350 0.071 8.324 0.112 8.324 0.180

8.279 8.212 8.144

7.663 7.596 7.528

5H 6H 7H

0 0 0

9.000 9.000 9.000

8.468 0.118 8.500 0.150 8.540 0.190

8.350 8.350 8.350

8.107 0.190 8.153 0.236 8.217 0.300

7.917 7.917 7.917

4h 6g 8g

0 0.028 0.028

9.000 0.132 8.972 0.212 8.972 0.335

8.868 8.760 8.637

8.188 0.075 8.160 0.118 8.160 0.190

8.113 8.042 7.970

7.343 7.272 7.200

5H 6H 7H

0 0 0

9.000 9.000 9.000

8.313 0.125 8.348 0.160 8.388 0.200

8.188 8.188 8.188

7.859 0.212 7.912 0.265 7.982 0.335

7.647 7.647 7.647

BS 3643-2:1981

1.25

9


max.

5


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


0.75

1 10 1.25

1.5

0.75

1

11

1.5

1

1.25 12 1.5

1.75

9

10

11

12

13

14

15


© BSI 12-1998



tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g

0 0.022

10.000 0.090 9.978 0.140

9.910 9.838

9.513 0.063 9.491 0.100

9.450 9.391

8.988 8.929

5H 6H 7H

0 0 0

10.000 10.000 10.000

9.619 0.106 9.645 0.132 9.683 0.170

9.513 9.513 9.513

9.338 0.150 9.378 0.190 9.424 0.236

9.188 9.188 9.188

4h 6g 8g

0 0.026 0.026

10.000 0.112 9.974 0.180 9.974 0.280

9.888 9.794 9.694

9.350 0.071 9.324 0.112 9.324 0.180

9.279 9.212 9.144

8.663 8.596 8.528

5H 6H 7H

0 0 0

10.000 10.000 10.000

9.468 0.118 9.500 0.150 9.540 0.190

9.350 9.350 9.350

9.107 0.190 9.153 0.236 9.217 0.300

8.917 8.917 8.917

4h 6g 8g

0 0.028 0.028

10.000 0.132 9.972 0.212 9.972 0.335

9.868 9.760 9.637

9.188 0.075 9.160 0.118 9.160 0.190

9.113 9.042 8.970

8.343 8.272 8.200

5H 6H 7H

0 0 0

10.000 10.000 10.000

9.313 0.125 9.348 0.160 9.388 0.200

9.188 9.188 9.188

8.859 0.212 8.912 0.265 8.982 0.335

8.647 8.647 8.647

4h 6g 8g

0 0.032 0.032

10.000 0.150 9.968 0.236 9.968 0.375

9.850 9.732 9.593

9.026 0.085 8.994 0.132 8.994 0.212

8.941 8.862 8.782

8.018 7.938 7.858

5H 6H 7H

0 0 0

10.000 10.000 10.000

9.166 0.140 9.206 0.180 9.250 0.224

9.026 9.026 9.026

8.612 0.236 8.676 0.300 8.751 0.375

8.376 8.376 8.376

4h 6g

0 0.022

11.000 0.090 10.978 0.140

10.910 10.513 0.063 10.838 10.491 0.100

10.450 10.391

9.988 9.929

5H 6H 7H

0 0 0

11.000 11.000 11.000

10.619 0.106 10.645 0.132 10.683 0.170

10.513 10.338 0.150 10.513 10.378 0.190 10.513 10.424 0.236

10.188 10.188 10.188

4h 6g 8g

0 0.026 0.026

11.000 0.112 10.974 0.180 10.974 0.280

10.888 10.350 0.071 10.794 10.324 0.112 10.694 10.324 0.180

10.279 10.212 10.144

9.663 9.596 9.528

5H 6H 7H

0 0 0

11.000 11.000 11.000

10.468 0.118 10.500 0.150 10.540 0.190

10.350 10.107 0.190 10.350 10.153 0.236 10.350 10.217 0.300

9.917 9.917 9.917

4h 6g 8g

0 0.032 0.032

11.000 0.150 10.968 0.236 10.968 0.375

10.850 10.026 0.085 10.732 9.994 0.132 10.593 9.994 0.212

9.941 9.862 9.782

9.018 8.938 8.858

5H 6H 7H

0 0 0

11.000 11.000 11.000

10.166 0.140 10.206 0.180 10.250 0.224

10.026 10.026 10.026

9.612 0.236 9.676 0.300 9.751 0.375

9.376 9.376 9.376

4h 6g 8g

0 0.026 0.026

12.000 0.112 11.974 0.180 11.974 0.280

11.888 11.350 0.075 11.794 11.324 0.118 11.694 11.324 0.190

11.275 10.659 11.206 10.590 11.134 10.518

5H 6H 7H

0 0 0

12.000 12.000 12.000

11.475 0.125 11.510 0.160 11.550 0.200

11.350 11.107 0.190 11.350 11.153 0.236 11.350 11.217 0.300

10.917 10.917 10.917

4h 6g 8g

0 0.028 0.028

12.000 0.132 11.972 0.212 11.972 0.335

11.868 11.188 0.085 11.760 11.160 0.132 11.637 11.160 0.212

11.103 10.333 11.028 10.257 10.948 10.177

5H 6H 7H

0 0 0

12.000 12.000 12.000

11.328 0.140 11.368 0.180 11.412 0.224

11.188 10.859 0.212 11.188 10.912 0.265 11.188 10.982 0.335

10.647 10.647 10.647

4h 6g 8g

0 0.032 0.032

12.000 0.150 11.968 0.236 11.968 0.375

11.850 11.026 0.090 11.732 10.994 0.140 11.593 10.994 0.224

10.936 10.012 10.854 9.930 10.770 9.846

5H 6H 7H

0 0 0

12.000 12.000 12.000

11.176 0.150 11.216 0.190 11.262 0.236

11.026 10.612 0.236 11.026 10.676 0.300 11.026 10.751 0.375

10.376 10.376 10.376

4h 6g 8g

0 0.034 0.034

12.000 0.170 11.966 0.265 11.966 0.425

11.830 10.863 0.095 11.701 10.829 0.150 11.541 10.829 0.236

10.768 10.679 10.593

5H 6H 7H

0 0 0

12.000 12.000 12.000

11.023 0.160 11.063 0.200 11.113 0.250

10.863 10.371 0.265 10.863 10.441 0.335 10.863 10.531 0.425

10.106 10.106 10.106

9.692 9.602 9.516

BS 3643-2:1981

6



2

3

4

5

6

Pitch

7

8


10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g 8g

0 0.026 0.026

14.000 0.112 13.974 0.180 13.974 0.280

13.888 13.350 0.075 13.794 13.324 0.118 13.694 13.324 0.190

13.275 12.659 13.206 12.590 13.134 12.518

5H 6H 7H

0 0 0

14.000 14.000 14.000

13.475 0.125 13.510 0.160 13.550 0.200

13.350 13.107 0.190 13.350 13.153 0.236 13.350 13.217 0.300

12.917 12.917 12.917

1.25

4h 6g 8g

0 0.028 0.028

14.000 0.132 13.972 0.212 13.972 0.335

13.868 13.188 0.085 13.760 13.160 0.132 13.637 13.160 0.212

13.103 12.333 13.028 12.257 12.948 12.177

5H 6H 7H

0 0 0

14.000 14.000 14.000

13.328 0.140 13.368 0.180 13.412 0.224

13.188 12.859 0.212 13.188 12.912 0.265 13.188 12.982 0.335

12.647 12.647 12.647

4h 6g 8g

0 0.032 0.032

14.000 0.150 13.968 0.236 13.968 0.375

13.850 13.026 0.090 13.732 12.994 0.140 13.593 12.994 0.224

12.936 12.012 12.854 11.930 12.770 11.846

5H 6H 7H

0 0 0

14.000 14.000 14.000

13.176 0.150 13.216 0.190 13.262 0.236

13.026 12.612 0.236 13.026 12.676 0.300 13.026 12.751 0.375

12.376 12.376 12.376

4h 6g 8g

0 0.038 0.038

14.000 0.180 13.962 0.280 13.962 0.450

13.820 12.701 0.100 13.682 12.663 0.160 13.512 12.663 0.250

12.601 11.369 12.503 11.271 12.413 11.181

5H 6H 7H

0 0 0

14.000 14.000 14.000

12.871 0.170 12.913 0.212 12.966 0.265

12.701 12.135 0.300 12.701 12.210 0.375 12.701 12.310 0.475

11.835 11.835 11.835

1

4h 6g 8g

0 0.026 0.026

15.000 0.112 14.974 0.180 14.974 0.280

14.888 14.350 0.075 14.794 14.324 0.118 14.694 14.324 0.190

14.275 13.659 14.206 13.590 14.134 13.518

5H 6H 7H

0 0 0

15.000 15.000 15.000

14.475 0.125 14.510 0.160 14.550 0.200

14.350 14.107 0.190 14.350 14.153 0.236 14.350 14.217 0.300

13.917 13.917 13.917

1.5

4h 6g 8g

0 0.032 0.032

15.000 0.150 14.968 0.236 14.968 0.375

14.850 14.026 0.090 14.732 13.994 0.140 14.593 13.994 0.224

13.936 13.012 13.854 12.930 13.770 12.846

5H 6H 7H

0 0 0

15.000 15.000 15.000

14.176 0.150 14.216 0.190 14.262 0.236

14.026 13.612 0.236 14.026 13.676 0.300 14.026 13.751 0.375

13.376 13.376 13.376

1

4h 6g 8g

0 0.026 0.026

16.000 0.112 15.974 0.180 15.974 0.280

15.888 15.350 0.075 15.794 15.324 0.118 15.694 15.324 0.190

15.275 14.659 15.206 14.590 15.134 14.518

5H 6H 7H

0 0 0

16.000 16.000 16.000

15.475 0.125 15.510 0.160 15.550 0.200

15.350 15.107 0.190 15.350 15.153 0.236 15.350 15.217 0.300

14.917 14.917 14.917

4h 6g 8g

0 0.032 0.032

16.000 0.150 15.968 0.236 15.968 0.375

15.850 15.026 0.090 15.732 14.994 0.140 15.593 14.994 0.224

14.936 14.012 14.854 13.930 14.770 13.846

5H 6H 7H

0 0 0

16.000 16.000 16.000

15.176 0.150 15.216 0.190 15.262 0.236

15.026 14.612 0.236 15.026 14.676 0.300 15.026 14.751 0.375

14.376 14.376 14.376

4h 6g 8g

0 0.038 0.038

16.000 0.180 15.962 0.280 15.962 0.450

15.820 14.701 0.100 15.682 14.663 0.160 15.512 14.663 0.250

14.601 13.369 14.503 13.271 14.413 13.181

5H 6H 7H

0 0 0

16.000 16.000 16.000

14.871 0.170 14.913 0.212 14.966 0.265

14.701 14.135 0.300 14.701 14.210 0.375 14.701 14.310 0.475

13.835 13.835 13.835

1

4h 6g 8g

0 0.026 0.026

17.000 0.112 16.974 0.180 16.974 0.280

16.888 16.350 0.075 16.794 16.324 0.118 16.694 16.324 0.190

16.275 15.659 16.206 15.590 16.134 15.518

5H 6H 7H

0 0 0

17.000 17.000 17.000

16.475 0.125 16.510 0.160 16.550 0.200

16.350 16.107 0.190 16.350 16.153 0.236 16.350 16.217 0.300

15.917 15.917 15.917

1.5

4h 6g 8g

0 0.032 0.032

17.000 0.150 16.968 0.236 16.968 0.375

16.850 16.026 0.090 16.732 15.994 0.140 16.593 15.994 0.224

15.936 15.012 15.854 14.930 15.770 14.846

5H 6H 7H

0 0 0

17.000 17.000 17.000

16.176 0.150 16.216 0.190 16.262 0.236

16.026 15.612 0.236 16.026 15.676 0.300 16.026 15.751 0.375

15.376 15.376 15.376

1.5

2

15

1.5

2

17

BS 3643-2:1981

1

14

16

9


max.

7


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


1

1.5 18 2

2.5

1

1.5 20 2

2.5

9

10

11

12

13

14

15


© BSI 12-1998



tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g 8g

0 0.026 0.026

18.000 0.112 17.974 0.180 17.974 0.280

17.888 17.350 0.075 17.794 17.324 0.118 17.694 17.324 0.190

17.275 16.659 17.206 16.590 17.134 16.518

5H 6H 7H

0 0 0

18.000 18.000 18.000

17.475 0.125 17.510 0.160 17.550 0.200

17.350 17.107 0.190 17.350 17.153 0.236 17.350 17.217 0.300

16.917 16.917 16.917

4h 6g 8g

0 0.032 0.032

18.000 0.150 17.968 0.236 17.968 0.375

17.850 17.026 0.090 17.732 16.994 0.140 17.593 16.994 0.224

16.936 16.012 16.854 15.930 16.770 15.846

5H 6H 7H

0 0 0

18.000 18.000 18.000

17.176 0.150 17.216 0.190 17.262 0.236

17.026 16.612 0.236 17.026 16.676 0.300 17.026 16.751 0.375

16.376 16.376 16.376

4h 6g 8g

0 0.038 0.038

18.000 0.180 17.962 0.280 17.962 0.450

17.820 16.701 0.100 17.682 16.663 0.160 17.512 16.663 0.250

16.601 15.369 16.503 15.271 16.413 15.181

5H 6H 7H

0 0 0

18.000 18.000 18.000

16.871 0.170 16.913 0.212 16.966 0.265

16.701 16.135 0.300 16.701 16.210 0.375 16.701 16.310 0.475

15.835 15.835 15.835

4h 6g 8g

0 0.042 0.042

18.000 0.212 17.958 0.335 17.958 0.530

17.788 16.376 0.106 17.623 16.334 0.170 17.428 16.334 0.265

16.270 14.730 16.164 14.624 16.069 14.529

5H 6H 7H

0 0 0

18.000 18.000 18.000

16.556 0.180 16.600 0.224 16.656 0.280

16.376 15.649 0.355 16.376 15.744 0.450 16.376 15.854 0.560

15.294 15.294 15.294

4h 6g 8g

0 0.026 0.026

20.000 0.112 19.974 0.180 19.974 0.280

19.888 19.350 0.075 19.794 19.324 0.118 19.694 19.324 0.190

19.275 18.659 19.206 18.590 19.134 18.518

5H 6H 7H

0 0 0

20.000 20.000 20.000

19.475 0.125 19.510 0.160 19.550 0.200

19.350 19.107 0.190 19.350 19.153 0.236 19.350 19.217 0.300

18.917 18.917 18.917

4h 6g 8g

0 0.032 0.032

20.000 0.150 19.968 0.236 19.968 0.375

19.850 19.026 0.090 19.732 18.994 0.140 19.593 18.994 0.224

18.936 18.012 18.854 17.930 18.770 17.846

5H 6H 7H

0 0 0

20.000 20.000 20.000

19.176 0.150 19.216 0.190 19.262 0.236

19.026 18.612 0.236 19.026 18.676 0.300 19.026 18.751 0.375

18.376 18.376 18.376

4h 6g 8g

0 0.038 0.038

20.000 0.180 19.962 0.280 19.962 0.450

19.820 18.701 0.100 19.682 18.663 0.160 19.512 18.663 0.250

18.601 17.369 18.503 17.271 18.413 17.181

5H 6H 7H

0 0 0

20.000 20.000 20.000

18.871 0.170 18.913 0.212 18.966 0.265

18.701 18.135 0.300 18.701 18.210 0.375 18.701 18.310 0.475

17.835 17.835 17.835

4h 6g 8g

0 0.042 0.042

20.000 0.212 19.958 0.335 19.958 0.530

19.788 18.376 0.106 19.623 18.334 0.170 19.428 18.334 0.265

18.270 16.730 18.164 16.624 18.069 16.529

5H 6H 7H

0 0 0

20.000 20.000 20.000

18.556 0.180 18.600 0.224 18.656 0.280

18.376 17.649 0.355 18.376 17.744 0.450 18.376 17.854 0.560

17.294 17.294 17.294

BS 3643-2:1981

8



2

3

4

5

6

Pitch

7

8

Coarse Fine Constant Tolerance Fund class dev.

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

0 0.026 0.026

22.000 0.112 21.888 21.350 0.075 21.275 20.659 21.974 0.180 21.794 21.324 0.118 21.206 20.590 21.974 0.280 21.694 21.324 0.190 21.134 20.518

5H 6H 7H

0 0 0

22.000 22.000 22.000

21.475 0.125 21.350 21.107 0.190 21.510 0.160 21.350 21.153 0.236 21.550 0.200 21.350 21.217 0.300

20.917 20.917 20.917

4h 6g 8g

0 0.032 0.032

22.000 0.150 21.850 21.026 0.090 20.936 20.012 21.968 0.236 21.732 20.994 0.140 20.854 19.930 21.968 0.375 21.593 20.994 0.224 20.770 19.846

5H 6H 7H

0 0 0

22.000 22.000 22.000

21.176 0.150 21.026 20.612 0.236 21.216 0.190 21.026 20.676 0.300 21.262 0.236 21.026 20.751 0.375

20.376 20.376 20.376

4h 6g 8g

0 0.038 0.038

22.000 0.180 21.820 20.701 0.100 20.601 19.369 21.962 0.280 21.682 20.663 0.160 20.503 19.271 21.962 0.450 21.512 20.663 0.250 20.413 19.181

5H 6H 7H

0 0 0

22.000 22.000 22.000

20.871 0.170 20.701 20.135 0.300 20.913 0.212 20.701 20.210 0.375 20.966 0.265 20.701 20.310 0.475

19.835 19.835 19.835

4h 6g 8g

0 0.042 0.042

22.000 0.212 21.788 20.376 0.106 20.270 18.730 21.958 0.335 21.623 20.334 0.170 20.164 18.624 21.958 0.530 21.428 20.334 0.265 20.069 18.529

5H 6H 7H

0 0 0

22.000 22.000 22.000

20.556 0.180 20.376 19.649 0.335 20.600 0.224 20.376 19.744 0.450 20.656 0.280 20.376 19.854 0.560

19.294 19.294 19.294

1

4h 6g 8g

0 0.026 0.026

24.000 0.112 23.888 23.350 0.080 23.270 22.654 23.974 0.180 23.794 23.324 0.125 23.199 22.583 23.974 0.280 23.694 23.324 0.200 23.124 22.508

5H 6H 7H

0 0 0

24.000 24.000 24.000

23.482 0.132 23.350 23.107 0.190 23.520 0.170 23.350 23.153 0.236 23.562 0.212 23.350 23.217 0.300

22.917 22.917 22.917

1.5

4h 6g 8g

0 0.032 0.032

24.000 0.150 23.850 23.026 0.095 22.931 22.007 23.968 0.236 23.732 22.994 0.150 22.844 21.920 23.968 0.375 23.593 22.994 0.236 22.758 21.834

5H 6H 7H

0 0 0

24.000 24.000 24.000

23.186 0.160 23.026 22.612 0.236 23.226 0.200 23.026 22.676 0.300 23.276 0.250 23.026 22.751 0.375

22.376 22.376 22.376

4h 6g 8g

0 0.038 0.038

24.000 0.180 23.820 22.701 0.106 22.595 21.363 23.962 0.280 23.682 22.663 0.170 22.493 21.261 23.962 0.450 23.512 22.663 0.265 22.398 21.166

5H 6H 7H

0 0 0

24.000 24.000 24.000

22.881 0.180 22.701 22.135 0.300 22.925 0.224 22.701 22.210 0.375 22.981 0.280 22.701 22.310 0.475

21.835 21.835 21.835

4h 6g 8g

0 0.048 0.048

24.000 0.236 23.764 22.051 0.125 21.926 20.078 23.952 0.375 23.577 22.003 0.200 21.803 19.955 23.952 0.600 23.352 22.003 0.315 21.688 19.840

5H 6H 7H

0 0 0

24.000 24.000 24.000

22.263 0.212 22.051 21.152 0.400 22.316 0.265 22.051 21.252 0.500 22.386 0.335 22.051 21.382 0.630

20.752 20.752 20.752

1

4h 6g 8g

0 0.026 0.026

25.000 0.112 24.888 24.350 0.080 24.270 23.654 24.974 0.180 24.794 24.324 0.125 24.199 23.583 24.974 0.280 24.694 24.324 0.200 24.124 23.508

5H 6H 7H

0 0 0

25.000 25.000 25.000

24.482 0.132 24.350 24.107 0.190 24.520 0.170 24.350 24.153 0.236 24.562 0.212 24.350 24.217 0.300

23.917 23.917 23.917

1.5

4h 6g 8g

0 0.032 0.032

25.000 0.150 24.850 24.026 0.095 23.931 23.007 24.968 0.236 24.732 23.994 0.150 23.844 22.920 24.968 0.375 24.593 23.994 0.236 23.758 22.834

5H 6H 7H

0 0 0

25.000 25.000 25.000

24.186 0.160 24.026 23.612 0.236 24.226 0.200 24.026 23.676 0.300 24.276 0.250 24.026 23.751 0.375

23.376 23.376 23.376

2

4h 6g 8g

0 0.038 0.038

25.000 0.180 24.820 23.701 0.106 23.595 22.363 24.962 0.280 24.682 23.663 0.170 23.493 22.261 24.962 0.450 24.512 23.663 0.265 23.398 22.166

5H 6H 7H

0 0 0

25.000 25.000 25.000

23.881 0.180 23.701 23.135 0.300 23.925 0.224 23.701 23.210 0.375 23.981 0.280 23.701 23.310 0.475

22.835 22.835 22.835

1.5 22 2

2.5

24 2

3

BS 3643-2:1981

4h 6g 8g

1

25

9


max.

9


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


26

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

26.000 0.150 25.850 25.026 0.095 24.931 24.007 25.968 0.236 25.732 24.994 0.150 24.844 23.920 25.968 0.375 25.593 24.994 0.236 24.758 23.834

5H 6H 7H

0 0 0

26.000 26.000 26.000

25.186 0.160 25.026 24.612 0.236 25.226 0.200 25.026 24.676 0.300 25.276 0.250 25.026 24.751 0.375

24.376 24.376 24.376

1

4h 6g 8g

0 0.026 0.026

27.000 0.112 26.888 26.350 0.080 26.270 25.654 26.974 0.180 26.794 26.324 0.125 26.199 25.583 26.974 0.280 26.694 26.324 0.200 26.124 25.508

5H 6H 7H

0 0 0

27.000 27.000 27.000

26.482 0.132 26.350 26.107 0.190 26.520 0.170 26.350 26.153 0.236 26.562 0.212 26.350 26.217 0.300

25.917 25.917 25.917

1.5

4h 6g 8g

0 0.032 0.032

27.000 0.150 26.850 26.026 0.095 25.931 25.007 26.968 0.236 26.732 25.994 0.150 25.844 24.920 26.968 0.375 26.593 25.994 0.236 25.758 24.834

5H 6H 7H

0 0 0

27.000 27.000 27.000

26.186 0.160 26.026 25.612 0.236 26.226 0.200 26.026 25.676 0.300 26.276 0.250 26.026 22.751 0.375

25.376 25.376 25.376

4h 6g 8g

0 0.038 0.038

27.000 0.180 26.820 25.701 0.106 25.595 24.363 26.962 0.280 26.682 25.663 0.170 25.493 24.261 26.962 0.450 26.512 25.663 0.265 25.398 24.166

5H 6H 7H

0 0 0

27.000 27.000 27.000

25.881 0.180 25.701 25.135 0.300 25.925 0.224 25.701 25.210 0.375 25.981 0.280 25.701 25.310 0.475

24.835 24.835 24.835

4h 6g 8g

0 0.048 0.048

27.000 0.236 26.764 25.051 0.125 24.926 23.078 26.952 0.375 26.577 25.003 0.200 24.803 22.955 26.952 0.600 26.352 25.003 0.315 24.688 22.840

5H 6H 7H

0 0 0

27.000 27.000 27.000

25.263 0.212 25.051 24.152 0.400 25.316 0.265 25.051 24.252 0.500 25.386 0.335 25.051 24.382 0.630

23.752 23.752 23.752

1

4h 6g 8g

0 0.026 0.026

28.000 0.112 27.888 27.350 0.080 27.270 26.654 27.974 0.180 27.794 27.324 0.125 27.199 26.583 27.974 0.280 27.694 27.324 0.200 27.124 26.508

5H 6H 7H

0 0 0

28.000 28.000 28.000

27.482 0.132 27.350 27.107 0.190 27.520 0.170 27.350 27.153 0.236 27.562 0.212 27.350 27.217 0.300

26.917 26.917 26.917

1.5

4h 6g 8g

0 0.032 0.032

28.000 0.150 27.850 27.026 0.095 26.931 26.007 27.968 0.236 27.732 26.994 0.150 26.844 25.920 27.968 0.375 27.593 26.994 0.236 26.758 25.834

5H 6H 7H

0 0 0

28.000 28.000 28.000

27.186 0.160 27.026 26.612 0.236 27.226 0.200 27.026 26.676 0.300 27.276 0.250 27.026 26.751 0.375

26.376 26.376 26.376

2

4h 6g 8g

0 0.038 0.038

28.000 0.180 27.820 26.701 0.106 26.595 25.363 27.962 0.280 27.682 26.663 0.170 26.493 25.261 27.962 0.450 27.512 26.663 0.265 26.390 25.166

5H 6H 7H

0 0 0

28.000 28.000 28.000

26.881 0.180 26.701 26.135 0.300 26.925 0.224 26.701 26.210 0.375 26.981 0.280 26.701 26.310 0.475

25.835 25.835 25.835

27 2

3

28

9


max.

© BSI 12-1998



BS 3643-2:1981

10



2

3

4

5

6

Pitch

7

8


30

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g 8g

0 0.026 0.026

30.000 0.112 29.888 29.350 0.080 29.270 28.654 29.974 0.180 29.794 29.324 0.125 29.199 28.583 29.974 0.280 29.694 29.324 0.200 29.124 28.508

5H 6H 7H

0 0 0

30.000 30.000 30.000

29.482 0.132 29.350 29.107 0.190 29.520 0.170 29.350 29.153 0.236 29.562 0.212 29.350 29.217 0.300

28.917 28.917 28.917

1.5

4h 6g 8g

0 0.032 0.032

30.000 0.150 29.850 29.026 0.095 28.931 28.007 29.968 0.236 29.732 28.994 0.150 28.844 27.920 29.968 0.375 29.593 28.994 0.236 28.758 27.834

5H 6H 7H

0 0 0

30.000 30.000 30.000

29.186 0.160 29.026 28.612 0.236 29.226 0.200 29.026 28.676 0.300 29.276 0.250 29.026 28.751 0.375

28.376 28.376 28.376

4h 6g 8g

0 0.038 0.038

30.000 0.180 29.820 28.701 0.106 28.595 27.363 29.962 0.280 29.682 28.663 0.170 28.493 27.261 29.962 0.450 29.512 28.663 0.265 28.398 27.166

5H 6H 7H

0 0 0

30.000 30.000 30.000

28.881 0.180 28.701 28.135 0.300 28.925 0.224 28.701 28.210 0.375 28.981 0.280 28.701 28.310 0.475

27.835 27.835 27.835

4h 6g 8g

0 0.048 0.048

30.000 0.236 29.764 28.051 0.125 27.926 26.078 29.952 0.375 29.577 28.003 0.200 27.803 25.955 29.952 0.600 29.352 28.003 0.315 27.688 25.840

5H 6H 7H

0 0 0

30.000 30.000 30.000

28.263 0.212 28.051 27.152 0.400 28.316 0.265 28.051 27.252 0.500 28.386 0.335 28.051 27.382 0.630

26.752 26.752 26.752

4h 6g 8g

0 0.053 0.053

30.000 0.265 29.735 27.727 0.132 27.595 25.438 29.947 0.425 29.522 27.674 0.212 27.462 25.305 29.947 0.670 29.277 27.674 0.335 27.339 25.182

5H 6H 7H

0 0 0

30.000 30.000 30.000

27.951 0.224 27.727 26.661 0.450 28.007 0.280 27.727 26.771 0.560 28.082 0.355 27.727 26.921 0.710

26.211 26.211 26.211

1.5

4h 6g 8g

0 0.032 0.032

32.000 0.150 31.850 31.026 0.095 30.931 30.007 31.968 0.236 31.732 30.994 0.150 30.844 29.920 31.968 0.375 31.593 30.994 0.236 30.758 29.834

5H 6H 7H

0 0 0

32.000 32.000 32.000

31.186 0.160 31.026 30.612 0.236 31.226 0.200 31.026 30.676 0.300 31.276 0.250 31.026 30.751 0.375

30.376 30.376 30.376

2

4h 6g 8g

0 0.038 0.038

32.000 0.180 31.820 30.701 0.106 30.595 29.363 31.962 0.280 31.682 30.663 0.170 30.493 29.261 31.962 0.450 31.512 30.663 0.265 30.398 29.166

5H 6H 7H

0 0 0

32.000 32.000 32.000

30.881 0.180 30.701 30.135 0.300 30.925 0.224 30.701 30.210 0.375 30.981 0.280 30.701 30.310 0.475

29.835 29.835 29.835

1.5

4h 6g 8g

0 0.032 0.032

33.000 0.150 32.850 32.026 0.095 31.931 31.007 32.968 0.236 32.732 31.994 0.150 31.844 30.920 32.968 0.375 32.593 31.994 0.236 31.758 30.834

5H 6H 7H

0 0 0

33.000 33.000 33.000

32.186 0.160 32.026 31.612 0.236 32.226 0.200 32.026 31.676 0.300 32.276 0.250 32.026 31.751 0.375

31.376 31.376 31.376

4h 6g 8g

0 0.038 0.038

33.000 0.180 32.820 31.701 0.106 31.595 30.363 32.962 0.280 32.682 31.663 0.170 31.493 30.261 32.962 0.450 32.512 31.663 0.265 31.398 30.166

5H 6H 7H

0 0 0

33.000 33.000 33.000

31.881 0.180 31.701 31.135 0.300 31.925 0.224 31.701 31.210 0.375 31.981 0.280 31.701 31.310 0.475

30.835 30.835 30.835

4h 6g 8g

0 0.048 0.048

33.000 0.236 32.764 31.051 0.125 30.926 29.078 32.952 0.375 32.577 31.003 0.200 30.803 28.955 32.952 0.600 32.352 31.003 0.315 30.688 28.840

5H 6H 7H

0 0 0

33.000 33.000 33.000

31.263 0.212 31.051 31.152 0.400 31.316 0.265 31.051 30.252 0.500 31.386 0.335 31.051 30.382 0.630

29.752 29.752 29.752

4h 6g 8g

0 0.053 0.053

33.000 0.265 32.735 30.727 0.132 30.595 28.438 32.947 0.425 32.522 30.674 0.212 30.462 28.305 32.947 0.670 32.277 30.674 0.335 30.339 28.182

5H 6H 7H

0 0 0

33.000 33.000 33.000

30.951 0.224 30.727 29.661 0.450 31.007 0.280 30.727 29.771 0.560 31.082 0.355 30.727 29.921 0.710

29.211 29.211 29.211

3

3.5

32

2 33 3

BS 3643-2:1981

1

2

3.5

9


max.

11


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


35

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g 8g

0 0.032 0.032

35.000 0.150 34.850 34.026 0.095 33.931 33.007 34.968 0.236 34.732 33.994 0.150 33.844 32.920 34.968 0.375 34.593 33.994 0.236 33.758 32.834

5H 6H 7H

0 0 0

35.000 35.000 35.000

34.186 0.160 34.026 33.612 0.236 34.226 0.200 34.026 33.676 0.300 34.276 0.250 34.026 33.751 0.375

33.376 33.376 33.376

1.5

4h 6g 8g

0 0.032 0.032

36.000 0.150 35.850 35.026 0.095 34.931 34.007 35.968 0.236 35.732 34.994 0.150 34.844 33.920 35.968 0.375 35.593 34.994 0.236 34.758 33.834

5H 6H 7H

0 0 0

36.000 36.000 36.000

35.186 0.160 35.026 34.612 0.236 35.226 0.200 35.026 34.676 0.300 35.276 0.250 35.026 34.751 0.375

34.376 34.376 34.376

2

4h 6g 8g

0 0.038 0.038

36.000 0.180 35.820 34.701 0.106 34.595 33.363 35.962 0.280 35.682 34.663 0.170 34.493 33.261 35.962 0.450 35.512 34.663 0.265 34.398 33.166

5H 6H 7H

0 0 0

36.000 36.000 36.000

34.881 0.180 34.701 34.135 0.300 34.925 0.224 34.701 34.210 0.375 34.981 0.280 34.701 34.310 0.475

33.835 33.835 33.835

3

4h 6g 8g

0 0.048 0.048

36.000 0.236 35.764 34.051 0.125 33.926 32.078 35.952 0.375 35.577 34.003 0.200 33.803 31.955 35.952 0.600 35.352 34.003 0.315 33.688 31.840

5H 6H 7H

0 0 0

36.000 36.000 36.000

34.263 0.212 34.051 33.152 0.400 34.316 0.265 34.051 33.252 0.500 34.386 0.335 34.051 33.382 0.630

32.752 32.752 32.752

4h 6g 8g

0 0.060 0.060

36.000 0.300 35.700 33.402 0.140 33.262 30.798 35.940 0.475 35.465 33.342 0.224 33.118 30.654 35.940 0.750 35.190 33.342 0.355 32.987 30.523

5H 6H 7H

0 0 0

36.000 36.000 36.000

33.638 0.236 33.402 32.145 0.475 33.702 0.300 33.402 32.270 0.600 33.777 0.375 33.402 32.420 0.750

31.670 31.670 31.670

1.5

4h 6g 8g

0 0.032 0.032

38.000 0.150 37.850 37.026 0.095 36.931 36.007 37.968 0.236 37.732 36.994 0.150 36.844 35.920 37.968 0.376 37.593 36.994 0.236 36.758 35.834

5H 6H 7H

0 0 0

38.000 38.000 38.000

37.186 0.160 37.026 33.612 0.236 37.226 0.200 37.026 36.676 0.300 37.276 0.250 37.026 36.751 0.375

36.376 36.376 36.376

1.5

4h 6g 8g

0 0.032 0.032

39.000 0.150 38.850 38.026 0.095 37.931 37.007 38.968 0.263 38.732 37.994 0.150 37.844 36.920 33.968 0.375 37.593 37.994 0.236 37.758 36.834

5H 6H 7H

0 0 0

39.000 39.000 39.000

38.186 0.160 38.026 37.612 0.236 38.226 0.200 38.026 37.676 0.300 38.276 0.250 38.026 37.751 0.375

37.376 37.376 37.376

2

4h 6g 8g

0 0.038 0.038

39.000 0.180 38.820 37.701 0.106 37.595 36.363 38.962 0.280 38.682 37.663 0.170 37.493 36.261 38.962 0.450 38.512 37.663 0.265 37.398 36.166

5H 6H 7H

0 0 0

39.000 39.000 39.000

37.881 0.180 37.701 37.135 0.300 37.925 0.224 37.701 37.210 0.375 37.981 0.280 37.701 37.310 0.475

36.835 36.835 36.835

3

4h 6g 8g

0 0.048 0.048

39.000 0.236 38.764 37.051 0.125 36.926 35.078 38.952 0.375 38.577 37.003 0.200 36.803 34.955 38.952 0.600 38.352 37.003 0.315 36.688 34.840

5H 6H 7H

0 0 0

39.000 39.000 39.000

37.263 0.212 37.051 36.152 0.400 37.316 0.265 37.051 36.252 0.500 37.386 0.335 37.051 36.382 0.630

35.752 35.752 35.752

4h 6g 8g

0 0.060 0.060

39.000 0.300 38.700 36.402 0.140 36.262 33.798 38.940 0.475 38.465 36.342 0.224 36.118 33.654 38.940 0.750 38.190 36.342 0.355 35.987 33.523

5H 6H 7H

0 0 0

39.000 39.000 39.000

36.638 0.236 36.402 35.145 0.475 36.702 0.300 36.402 35.270 0.600 36.777 0.375 36.402 35.420 0.750

34.670 34.670 34.670

4

39

4

10

1.5

36

38

9


max.

© BSI 12-1998



BS 3643-2:1981

12



2

3

4

5

6

Pitch

7

8


40

42

4.5

9

10

11

12

13

14

15


tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

40.000 0.150 39.850 39.026 0.095 38.931 38.007 39.968 0.236 38.732 38.994 0.150 38.844 37.920 39.968 0.375 39.593 38.994 0.236 38.758 37.834

5H 6H 7H

0 0 0

40.000 40.000 40.000

39.186 0.160 39.026 38.612 0.236 39.226 0.200 39.026 38.676 0.300 39.276 0.250 39.026 38.751 0.375

38.376 38.376 38.376

2

4h 6g 8g

0 0.038 0.038

40.000 0.180 39.820 38.701 0.106 38.595 37.363 39.962 0.280 39.682 38.663 0.170 38.493 37.261 39.962 0.450 39.512 38.663 0.265 38.398 37.166

5H 6H 7H

0 0 0

40.000 40.000 40.000

38.881 0.180 38.701 38.135 0.300 38.925 0.224 38.701 38.210 0.375 38.981 0.280 38.701 38.310 0.475

37.835 37.835 37.835

3

4h 6g 8g

0 0.048 0.048

40.000 0.236 39.764 38.051 0.125 37.926 36.078 39.952 0.375 39.577 38.003 0.200 37.803 35.955 39.952 0.600 39.352 38.003 0.315 37.688 35.840

5H 6H 7H

0 0 0

40.000 40.000 40.000

38.263 0.212 38.051 37.152 0.400 38.316 0.265 38.051 37.252 0.500 38.386 0.335 38.051 37.382 0.630

36.752 36.752 36.752

1.5

4h 6g 8g

0 0.032 0.032

42.000 0.150 41.850 41.026 0.095 40.931 40.007 41.968 0.236 41.732 40.994 0.150 40.844 39.920 41.968 0.375 41.593 40.994 0.236 40.758 39.834

5H 6H 7H

0 0 0

42.000 42.000 42.000

41.186 0.160 41.026 40.612 0.236 41.226 0.200 41.026 40.676 0.300 41.276 0.250 41.026 40.751 0.375

40.376 40.376 40.376

2

4h 6g 8g

0 0.038 0.038

42.000 0.180 41.820 40.701 0.106 40.595 39.363 41.962 0.280 41.682 40.663 0.170 40.493 39.261 41.962 0.450 41.512 40.663 0.265 40.398 39.166

5H 6H 7H

0 0 0

42.000 42.000 42.000

40.881 0.180 40.701 40.135 0.300 40.925 0.224 40.701 40.210 0.375 40.981 0.280 40.701 40.310 0.475

39.835 39.835 39.835

3

4h 6g 8g

0 0.048 0.048

42.000 0.236 41.764 40.051 0.125 39.926 38.078 41.952 0.375 41.577 40.003 0.200 39.803 37.955 41.952 0.600 41.352 40.003 0.315 39.688 37.840

5H 6H 7H

0 0 0

42.000 42.000 42.000

40.263 0.212 40.051 39.152 0.400 40.316 0.265 40.051 39.252 0.500 40.386 0.335 40.051 39.382 0.630

38.752 38.752 38.752

4

4h 6g 8g

0 0.060 0.060

42.000 0.300 41.700 39.402 0.140 39.262 36.798 41.940 0.475 41.465 39.342 0.224 39.118 36.654 41.940 0.750 41.190 39.342 0.355 38.987 36.523

5H 6H 7H

0 0 0

42.000 42.000 42.000

39.638 0.236 39.402 38.145 0.475 39.702 0.300 39.402 38.270 0.600 39.777 0.375 39.402 38.420 0.750

37.670 37.670 37.670

4h 6g 8g

0 0.063 0.063

42.000 0.315 41.685 39.077 0.150 38.927 36.155 41.937 0.500 41.437 39.014 0.236 38.778 36.006 41.937 0.800 41.137 39.014 0.375 38.639 35.867

5H 6H 7H

0 0 0

42.000 42.000 42.000

39.327 0.250 39.077 37.659 0.530 39.392 0.315 39.077 37.799 0.670 39.477 0.400 39.077 37.979 0.850

37.129 37.129 37.129

BS 3643-2:1981

13


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


45

5.0

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

45.000 0.150 44.850 44.026 0.095 43.931 43.007 44.968 0.236 44.732 43.994 0.150 43.844 42.920 44.968 0.375 44.593 43.994 0.236 43.758 42.834

5H 6H 7H

0 0 0

45.000 45.000 45.000

44.186 0.160 44.026 43.612 0.236 44.226 0.200 44.026 43.676 0.300 44.276 0.250 44.026 43.751 0.375

43.376 43.376 43.376

2.0

4h 6g 8g

0 0.038 0.038

45.000 0.180 44.820 43.701 0.106 43.595 42.363 44.962 0.280 44.682 43.663 0.170 43.493 42.261 44.962 0.450 44.512 43.663 0.265 43.398 42.166

5H 6H 7H

0 0 0

45.000 45.000 45.000

43.881 0.180 43.701 43.135 0.300 43.925 0.224 43.701 43.210 0.375 43.981 0.280 43.701 43.310 0.475

42.835 42.835 42.835

3.0

4h 6g 8g

0 0.048 0.048

45.000 0.236 44.764 43.051 0.125 42.926 41.078 44.952 0.375 44.577 43.003 0.200 42.803 40.955 44.952 0.600 44.352 43.003 0.315 42.688 40.840

5H 6H 7H

0 0 0

45.000 45.000 45.000

43.263 0.212 43.051 42.152 0.400 43.316 0.265 43.051 42.252 0.500 43.386 0.335 43.051 42.382 0.630

41.752 41.752 41.752

4.0

4h 6g 8g

0 0.060 0.060

45.000 0.300 44.700 42.402 0.140 42.262 39.798 44.940 0.475 44.465 42.342 0.224 42.118 39.654 44.940 0.750 44.190 42.342 0.355 41.987 39.523

5H 6H 7H

0 0 0

45.000 45.000 45.000

42.638 0.236 42.402 41.145 0.475 42.702 0.300 42.402 41.270 0.600 42.777 0.375 42.402 41.420 0.750

40.670 40.670 40.670

4h 6g 8g

0 0.063 0.063

45.000 0.315 44.685 42.077 0.150 41.927 39.155 44.937 0.500 44.437 42.014 0.236 41.778 39.006 44.937 0.800 44.137 42.014 0.375 41.639 38.867

5H 6H 7H

0 0 0

45.000 45.000 45.000

42.327 0.250 42.077 40.659 0.530 42.392 0.315 42.077 40.799 0.670 42.477 0.400 42.077 40.979 0.850

40.129 40.129 40.129

1.5

4h 6g 8g

0 0.032 0.032

48.000 0.150 47.850 47.026 0.100 46.926 46.002 47.968 0.236 47.732 46.994 0.160 46.834 45.910 47.968 0.375 47.593 46.994 0.250 46.744 45.820

5H 6H 7H

0 0 0

48.000 48.000 48.000

47.196 0.170 47.026 46.612 0.236 47.238 0.212 47.026 46.676 0.300 47.291 0.265 47.026 46.751 0.375

46.376 46.376 46.376

2.0

4h 6g 8g

0 0.038 0.038

48.000 0.180 47.820 46.701 0.112 46.589 45.357 47.962 0.280 47.682 46.663 0.180 46.483 45.251 47.962 0.450 47.512 46.663 0.280 46.383 45.151

5H 6H 7H

0 0 0

48.000 48.000 48.000

46.891 0.190 46.701 46.135 0.300 46.937 0.236 46.701 46.210 0.375 47.001 0.300 46.701 46.310 0.475

45.835 45.835 45.835

3.0

4h 6g 8g

0 0.048 0.048

48.000 0.236 47.764 46.051 0.132 45.919 44.071 47.952 0.375 47.577 46.003 0.212 45.791 43.943 47.952 0.600 47.352 46.003 0.335 45.668 43.820

5H 6H 7H

0 0 0

48.000 48.000 48.000

46.275 0.224 46.051 45.152 0.400 46.331 0.280 46.051 45.252 0.500 46.406 0.355 46.051 45.382 0.630

44.752 44.752 44.752

4.0

4h 6g 8g

0 0.060 0.060

48.000 0.300 47.700 45.402 0.150 45.252 42.788 47.940 0.475 47.465 45.342 0.236 45.106 42.642 47.940 0.750 47.190 45.342 0.375 44.967 42.503

5H 6H 7H

0 0 0

48.000 48.000 48.000

45.652 0.250 45.402 44.145 0.475 45.717 0.315 45.402 44.270 0.600 45.802 0.400 45.402 44.420 0.750

43.670 43.670 43.670

4h 6g 8g

0 0.071 0.071

48.000 0.355 47.665 44.752 0.160 44.592 41.512 47.929 0.530 47.399 44.681 0.250 44.431 41.351 47.929 0.850 47.079 44.681 0.400 44.281 41.201

5H 6H 7H

0 0 0

48.000 48.000 48.000

45.017 0.265 44.752 43.147 0.560 45.087 0.335 44.752 43.297 0.710 45.177 0.425 44.752 43.487 0.900

42.587 42.587 42.587

4.5

48

9


max.

© BSI 12-1998



BS 3643-2:1981

14



2

3

4

5

6

Pitch

7

8


50

52

5.0

9

10

11

12

13

14

15


tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.

Minor Tolerance Fund Major class dev. diameter diameter min.

min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

50.000 0.150 49.850 49.026 0.100 48.926 48.002 49.968 0.236 49.732 48.994 0.160 48.834 47.910 49.968 0.375 49.593 48.994 0.250 48.744 47.820

5H 6H 7H

0 0 0

50.000 50.000 50.000

49.196 0.170 49.026 48.612 0.236 49.238 0.212 49.026 48.676 0.300 49.291 0.265 49.026 48.751 0.375

48.376 48.376 48.376

2.0

4h 6g 8g

0 0.038 0.038

50.000 0.180 49.820 48.701 0.112 48.589 47.357 49.962 0.280 49.682 48.663 0.180 48.483 47.251 49.962 0.450 49.512 48.663 0.280 48.383 47.151

5H 6H 7H

0 0 0

50.000 50.000 50.000

48.891 0.190 48.701 48.135 0.300 48.937 0.236 48.701 48.210 0.375 49.001 0.300 48.701 48.310 0.475

47.835 47.835 47.835

3.0

4h 6g 8g

0 0.048 0.048

50.000 0.236 49.764 48.051 0.132 47.919 46.071 49.952 0.375 49.577 48.003 0.212 47.791 45.943 49.952 0.600 49.352 48.003 0.335 47.668 45.820

5H 6H 7H

0 0 0

50.000 50.000 50.000

48.275 0.224 48.051 47.152 0.400 48.331 0.280 48.051 47.252 0.500 48.406 0.355 48.051 47.382 0.630

46.752 46.752 46.752

1.5

4h 6g 8g

0 0.032 0.032

52.000 0.150 51.850 51.026 0.100 50.926 50.002 51.968 0.236 51.732 50.994 0.160 50.834 49.910 51.968 0.375 51.593 50.994 0.250 50.744 49.820

5H 6H 7H

0 0 0

52.000 52.000 52.000

51.196 0.170 51.026 50.612 0.236 51.238 0.212 51.026 50.676 0.300 51.291 0.265 51.026 50.751 0.375

50.376 50.376 50.376

2.0

4h 6g 8g

0 0.038 0.038

52.000 0.180 51.820 50.701 0.112 50.589 49.357 51.962 0.280 51.682 50.663 0.180 50.483 49.251 51.962 0.450 51.512 50.663 0.280 50.383 49.151

5H 6H 7H

0 0 0

52.000 52.000 52.000

50.891 0.190 50.701 50.135 0.300 50.937 0.236 50.701 50.210 0.375 51.001 0.300 50.701 50.310 0.475

49.835 49.835 49.835

3.0

4h 6g 8g

0 0.048 0.048

52.000 0.236 51.764 50.051 0.132 49.919 48.071 51.952 0.375 51.577 50.003 0.212 49.791 47.943 51.952 0.600 51.352 50.003 0.335 49.668 47.820

5H 6H 7H

0 0 0

52.000 52.000 52.000

50.275 0.224 50.051 49.152 0.400 50.331 0.280 50.051 49.252 0.500 50.406 0.355 50.051 49.382 0.630

48.752 48.752 48.752

4.0

4h 6g 8g

0 0.060 0.060

52.000 0.300 51.700 49.402 0.150 49.252 46.788 51.940 0.475 51.465 49.342 0.236 49.106 46.642 51.940 0.750 51.190 49.342 0.375 48.967 46.503

5H 6H 7H

0 0 0

52.000 52.000 52.000

49.652 0.250 49.402 48.145 0.475 49.717 0.315 49.402 48.270 0.600 49.802 0.400 49.402 48.420 0.750

47.670 47.670 47.670

4h 6g 8g

0 0.071 0.071

52.000 0.335 51.665 48.752 0.160 48.592 45.512 51.929 0.530 51.399 48.681 0.250 48.431 45.351 51.929 0.850 51.079 48.681 0.400 48.281 45.201

5H 6H 7H

0 0 0

52.000 52.000 52.000

49.017 0.265 48.752 47.147 0.560 49.087 0.335 48.752 47.297 0.710 49.177 0.425 48.752 47.687 0.900

46.587 46.587 46.587

BS 3643-2:1981

15


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


5.5

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

55.000 0.150 54.850 54.026 0.100 53.926 53.002 54.968 0.236 54.732 53.994 0.160 53.834 52.910 54.968 0.375 54.593 53.994 0.250 53.744 52.820

5H 6H 7H

0 0 0

55.000 55.000 55.000

54.196 0.170 54.026 53.612 0.236 54.238 0.212 54.026 53.676 0.300 54.291 0.265 54.026 53.751 0.375

53.376 53.376 53.376

2.0

4h 6g 8g

0 0.038 0.038

55.000 0.180 54.820 53.701 0.112 53.589 52.357 54.962 0.280 54.682 53.663 0.180 53.483 52.251 54.962 0.450 54.512 53.663 0.280 53.383 52.151

5H 6H 7H

0 0 0

55.000 55.000 55.000

53.891 0.190 53.701 53.135 0.300 53.937 0.236 53.701 53.210 0.375 54.001 0.300 53.701 53.310 0.475

52.835 52.835 52.835

3.0

4h 6g 8g

0 0.048 0.048

55.000 0.236 54.764 53.051 0.132 52.919 51.071 54.952 0.375 54.577 53.003 0.212 52.791 50.943 54.952 0.600 54.352 53.003 0.335 52.668 50.820

5H 6H 7H

0 0 0

55.000 55.000 55.000

53.275 0.224 53.051 52.152 0.400 53.331 0.280 53.051 52.252 0.500 53.406 0.355 53.051 52.382 0.630

51.752 51.752 51.752

4.0

4h 6g 8g

0 0.060 0.060

55.000 0.300 54.700 52.402 0.150 52.252 49.788 54.940 0.475 54.465 52.342 0.236 52.106 49.642 54.940 0.750 54.190 52.342 0.375 51.967 49.503

5H 6H 7H

0 0 0

55.000 55.000 55.000

52.652 0.250 52.402 51.145 0.475 52.717 0.315 52.402 51.270 0.600 52.802 0.400 52.402 51.420 0.750

50.670 50.670 50.670

1.5

4h 6g 8g

0 0.032 0.032

56.000 0.150 55.850 55.026 0.100 54.926 54.002 55.968 0.236 55.732 54.994 0.160 54.834 53.910 55.968 0.375 55.593 54.994 0.250 54.744 53.820

5H 6H 7H

0 0 0

56.000 56.000 56.000

55.196 0.170 55.026 54.612 0.236 55.238 0.212 55.026 54.676 0.300 55.291 0.265 55.026 54.751 0.375

54.376 54.376 54.376

2.0

4h 6g 8g

0 0.038 0.038

56.000 0.180 55.820 54.701 0.112 54.589 53.357 55.962 0.280 55.682 54.663 0.180 54.483 53.251 55.962 0.450 55.512 54.663 0.280 54.383 53.151

5H 6H 7H

0 0 0

56.000 56.000 56.000

54.891 0.190 54.701 54.135 0.300 54.937 0.236 54.701 54.210 0.375 55.001 0.300 54.701 54.310 0.475

53.835 53.835 53.835

3.0

4h 6g 8g

0 0.048 0.048

56.000 0.236 55.764 54.051 0.132 53.919 52.071 55.952 0.375 55.577 54.003 0.212 53.791 51.943 55.952 0.600 55.352 54.003 0.335 53.668 51.820

5H 6H 7H

0 0 0

56.000 56.000 56.000

54.275 0.224 54.051 53.152 0.400 54.331 0.280 54.051 53.252 0.500 54.406 0.355 54.051 53.382 0.630

52.752 52.752 52.752

4.0

4h 6g 8g

0 0.060 0.060

56.000 0.300 55.700 53.402 0.150 53.252 50.788 55.940 0.475 55.465 53.342 0.236 53.106 50.642 55.940 0.750 55.190 53.342 0.375 52.967 50.503

5H 6H 7H

0 0 0

56.000 56.000 56.000

53.652 0.250 53.402 52.145 0.475 53.717 0.315 53.402 52.270 0.600 53.802 0.400 53.402 52.430 0.750

51.670 51.670 51.670

4h 6g 8g

0 0.075 0.075

56.000 0.355 55.645 52.428 0.170 52.258 48.870 55.925 0.560 55.365 52.353 0.265 52.088 48.700 55.925 0.900 55.025 52.353 0.425 51.928 48.540

5H 6H 7H

0 0 0

56.000 56.000 56.000

52.708 0.280 52.428 50.646 0.600 52.783 0.355 52.428 50.796 0.750 52.878 0.450 52.428 50.996 0.950

50.046 50.046 50.046

55

56

9


max.

© BSI 12-1998



BS 3643-2:1981

16



2

3

4

5

6

Pitch

7

8


5.5

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

58.000 0.150 57.850 57.026 0.100 56.926 56.002 57.968 0.236 57.732 56.994 0.160 56.834 55.910 57.968 0.375 57.593 56.994 0.250 56.744 55.820

5H 6H 7H

0 0 0

58.000 58.000 58.000

57.196 0.170 57.026 56.612 0.236 57.238 0.212 57.026 56.676 0.300 57.291 0.265 57.026 56.751 0.375

56.376 56.376 56.376

2.0

4h 6g 8g

0 0.038 0.038

58.000 0.180 57.820 56.701 0.112 56.589 55.357 57.962 0.280 57.682 56.663 0.180 56.483 55.251 57.962 0.450 57.512 56.663 0.280 56.383 55.151

5H 6H 7H

0 0 0

58.000 58.000 58.000

56.891 0.190 56.701 56.135 0.300 56.937 0.236 56.701 56.210 0.375 57.001 0.300 56.701 56.310 0.475

55.835 55.835 55.835

3.0

4h 6g 8g

0 0.048 0.048

58.000 0.236 57.764 56.051 0.132 55.919 54.071 57.952 0.375 57.577 56.003 0.212 55.791 53.943 57.952 0.600 57.352 56.003 0.335 55.668 53.820

5H 6H 7H

0 0 0

58.000 58.000 58.000

56.275 0.224 56.051 55.152 0.400 56.331 0.280 56.051 55.252 0.500 56.406 0.355 56.051 55.382 0.630

54.752 54.752 54.752

4.0

4h 6g 8g

0 0.060 0.060

58.000 0.300 57.700 55.402 0.150 55.252 52.788 57.940 0.475 57.465 55.342 0.236 55.106 52.642 57.940 0.750 57.190 55.342 0.375 54.967 52.503

5H 6H 7H

0 0 0

58.000 58.000 58.000

55.652 0.250 55.402 54.145 0.475 55.717 0.315 55.402 54.270 0.600 55.802 0.400 55.402 54.420 0.750

53.670 53.670 53.670

1.5

4h 6g 8g

0 0.032 0.032

60.000 0.150 59.850 59.026 0.100 58.926 58.002 59.968 0.236 59.732 58.994 0.160 58.834 57.910 59.968 0.375 59.593 58.994 0.250 58.744 57.820

5H 6H 7H

0 0 0

60.000 60.000 60.000

59.196 0.170 59.026 58.612 0.236 59.238 0.212 59.026 58.676 0.300 59.291 0.265 59.026 58.751 0.375

58.376 58.376 58.376

2.0

4h 6g 8g

0 0.038 0.038

60.000 0.180 59.820 58.701 0.112 58.589 57.357 59.962 0.280 59.682 58.663 0.180 54.483 57.251 59.962 0.450 59.512 58.663 0.280 58.383 57.151

5H 6H 7H

0 0 0

60.000 60.000 60.000

58.891 0.190 58.701 58.135 0.300 58.937 0.236 58.701 58.210 0.375 59.001 0.300 58.701 58.310 0.475

57.835 57.835 57.835

3.0

4h 6g 8g

0 0.048 0.048

60.000 0.236 59.764 58.051 0.132 57.919 56.071 59.952 0.375 59.577 58.003 0.212 57.791 55.943 59.952 0.600 59.352 58.003 0.335 57.668 55.820

5H 6H 7H

0 0 0

60.000 60.000 60.000

58.275 0.224 58.051 57.152 0.400 58.331 0.280 58.051 57.252 0.500 58.406 0.355 58.051 57.382 0.630

56.752 56.752 56.752

4.0

4h 6g 8g

0 0.060 0.060

60.000 0.300 59.700 57.402 0.150 57.252 54.788 59.940 0.475 59.465 57.342 0.236 57.106 54.642 59.940 0.750 59.190 57.342 0.375 56.967 54.503

5H 6H 7H

0 0 0

60.000 60.000 60.000

57.652 0.250 57.402 56.145 0.475 57.717 0.315 57.402 56.270 0.600 57.802 0.400 57.402 56.420 0.750

55.670 55.670 55.670

4h 6g 8g

0 0.075 0.075

60.000 0.355 59.645 56.428 0.170 56.258 52.870 59.925 0.560 59.365 56.353 0.265 56.088 52.700 59.925 0.900 59.025 56.353 0.425 55.928 52.540

5H 6H 7H

0 0 0

60.000 60.000 60.000

56.708 0.280 56.428 54.646 0.600 56.783 0.355 56.428 54.796 0.750 56.878 0.450 56.428 54.996 0.950

54.046 54.046 54.046

58

60

9


max.

BS 3643-2:1981

17


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8


6

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

62.000 0.150 61.850 61.026 0.100 60.926 60.002 61.968 0.236 61.732 60.994 0.160 60.834 59.910 61.968 0.375 61.593 60.994 0.250 60.744 59.820

5H 6H 7H

0 0 0

62.000 62.000 62.000

61.196 0.170 61.026 60.612 0.236 61.238 0.212 61.026 60.676 0.300 61.291 0.265 61.026 60.751 0.375

60.376 60.376 60.376

2

4h 6g 8g

0 0.038 0.038

62.000 0.180 61.820 60.701 0.112 60.589 59.357 61.962 0.280 61.682 60.663 0.180 60.483 59.251 61.962 0.450 61.512 60.663 0.280 60.383 59.151

5H 6H 7H

0 0 0

62.000 62.000 62.000

60.891 0.190 60.701 60.135 0.300 60.937 0.236 60.701 60.210 0.375 61.001 0.300 60.701 60.310 0.475

59.835 59.835 59.835

3

4h 6g 8g

0 0.048 0.048

62.000 0.236 61.764 60.051 0.132 59.919 58.071 61.952 0.375 61.577 60.003 0.212 59.791 57.943 61.952 0.600 61.352 60.003 0.335 59.668 57.820

5H 6H 7H

0 0 0

62.000 62.000 62.000

60.275 0.224 60.051 59.152 0.400 60.331 0.280 60.051 59.252 0.500 60.406 0.355 60.051 59.382 0.630

58.752 58.752 58.752

4

4h 6g 8g

0 0.060 0.060

62.000 0.300 61.700 59.402 0.150 59.252 56.788 61.940 0.475 61.465 59.342 0.236 59.106 56.642 61.940 0.750 61.190 59.342 0.375 58.967 56.503

5H 6H 7H

0 0 0

62.000 62.000 62.000

59.652 0.250 59.402 58.145 0.475 59.717 0.315 59.402 58.270 0.600 59.802 0.400 59.402 58.420 0.750

57.670 57.670 57.670

1.5

4h 6g 8g

0 0.032 0.032

64.000 0.150 63.850 63.026 0.100 62.926 62.002 63.968 0.236 63.732 62.994 0.160 62.834 61.910 63.968 0.375 63.593 62.994 0.250 62.744 61.820

5H 6H 7H

0 0 0

64.000 64.000 64.000

63.196 0.170 63.026 62.612 0.236 63.238 0.212 63.026 62.676 0.300 63.291 0.265 63.026 62.751 0.375

62.376 62.376 62.376

2

4h 6g 8g

0 0.038 0.038

64.000 0.180 63.820 62.701 0.112 62.589 61.357 63.962 0.280 63.682 62.663 0.180 62.483 61.251 63.962 0.450 63.512 62.663 0.280 62.383 61.151

5H 6H 7H

0 0 0

64.000 64.000 64.000

62.891 0.190 62.701 62.135 0.300 62.937 0.236 62.701 62.210 0.375 63.001 0.300 62.701 62.310 0.475

61.835 61.835 61.835

3

4h 6g 8g

0 0.048 0.048

64.000 0.236 63.764 62.051 0.132 61.919 60.071 63.952 0.375 63.577 62.003 0.212 61.791 59.943 63.952 0.600 63.352 62.003 0.335 61.668 59.820

5H 6H 7H

0 0 0

64.000 64.000 64.000

62.275 0.224 62.051 61.152 0.400 62.331 0.280 62.051 61.252 0.500 62.406 0.355 62.051 61.382 0.630

60.752 60.752 60.752

4

4h 6g 8g

0 0.060 0.060

64.000 0.300 63.700 61.402 0.150 61.252 58.788 63.940 0.475 63.465 61.342 0.236 61.106 58.642 63.940 0.750 63.190 61.342 0.375 60.967 58.503

5H 6H 7H

0 0 0

64.000 64.000 64.000

61.652 0.250 61.402 60.145 0.475 61.717 0.315 61.402 60.270 0.600 61.802 0.400 61.402 60.420 0.750

59.670 59.670 59.670

4h 6g 8g

0 0.080 0.080

64.000 0.375 63.625 60.103 0.180 59.923 56.227 63.920 0.600 63.320 60.023 0.280 59.743 56.047 63.920 0.950 62.970 60.023 0.450 59.573 55.877

5H 6H 7H

0 0 0

64.000 64.000 64.000

60.403 0.300 60.103 58.135 0.630 60.478 0.375 60.103 58.305 0.800 60.578 0.475 60.103 58.505 1.000

57.505 57.505 57.505

62

64

9


max.

© BSI 12-1998



BS 3643-2:1981

18



2

3

4

5

6

Pitch

7

8


6

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

65.000 0.150 64.850 64.026 0.100 63.926 63.002 64.968 0.236 64.732 63.994 0.160 68.834 62.910 64.968 0.375 64.593 63.994 0.250 63.744 62.820

5H 6H 7H

0 0 0

65.000 65.000 65.000

64.196 0.170 64.026 63.612 0.236 64.238 0.212 64.026 63.676 0.300 64.291 0.265 64.026 63.751 0.375

63.376 63.376 63.376

2

4h 6g 8g

0 0.038 0.048

65.000 0.180 64.820 63.701 0.112 63.589 62.357 64.962 0.280 64.682 63.663 0.180 63.483 62.251 64.962 0.450 64.512 63.663 0.280 63.383 62.151

5H 6H 7H

0 0 0

65.000 65.000 65.000

63.891 0.190 63.701 63.135 0.300 63.937 0.236 63.701 63.210 0.375 64.001 0.300 63.701 63.310 0.475

62.835 62.835 62.835

3

4h 6g 8g

0 0.048 0.048

65.000 0.236 64.764 63.051 0.132 62.919 61.071 64.952 0.375 64.577 63.003 0.212 62.791 60.943 64.952 0.600 64.352 63.003 0.335 62.668 60.820

5H 6H 7H

0 0 0

65.000 65.000 65.000

63.275 0.224 63.051 62.152 0.400 63.331 0.280 63.051 62.252 0.500 63.406 0.355 63.051 62.382 0.630

61.752 61.752 61.752

4

4h 6g 8g

0 0.060 0.060

65.000 0.300 64.700 62.402 0.150 62.252 59.788 64.940 0.475 64.465 62.342 0.236 62.106 59.642 64.940 0.750 64.190 62.342 0.375 61.967 69.503

5H 6H 7H

0 0 0

65.000 65.000 65.000

62.652 0.250 62.402 61.145 0.475 62.717 0.315 62.402 61.270 0.600 62.802 0.400 62.402 61.420 0.750

60.670 60.670 60.670

1.5

4h 6g 8g

0 0.032 0.032

68.000 0.150 67.850 67.026 0.100 66.926 66.002 67.968 0.236 67.732 66.994 0.160 66.834 65.910 67.968 0.375 67.593 66.994 0.250 66.744 65.820

5H 6H 7H

0 0 0

68.000 68.000 68.000

67.196 0.170 67.026 66.612 0.236 67.238 0.212 67.026 66.676 0.300 67.291 0.265 67.026 66.751 0.375

66.376 66.376 66.376

2

4h 6g 8g

0 0.038 0.038

68.000 0.180 67.820 66.701 0.112 66.589 65.357 37.962 0.280 67.682 66.663 0.180 66.483 65.251 67.962 0.450 67.512 66.663 0.280 66.383 65.151

5H 6H 7H

0 0 0

68.000 68.000 68.000

66.891 0.190 66.701 66.135 0.300 66.937 0.236 66.701 66.210 0.375 67.001 0.300 66.701 66.310 0.475

65.835 65.835 65.835

3

4h 6g 8g

0 0.048 0.048

68.000 0.236 67.764 66.051 0.132 65.919 64.071 67.952 0.375 67.577 66.003 0.212 65.791 53.943 67.952 0.600 67.352 66.003 0.335 65.668 53.820

5H 6H 7H

0 0 0

68.000 68.000 68.000

66.275 0.224 66.051 65.152 0.400 66.331 0.280 66.051 65.252 0.500 66.406 0.355 66.051 65.382 0.630

64.752 64.752 64.752

4

4h 6g 8g

0 0.060 0.060

68.000 0.300 67.700 65.402 0.150 65.252 62.788 67.940 0.475 67.465 65.342 0.236 65.106 62.642 67.940 0.750 67.190 65.342 0.375 64.967 62.503

5H 6H 7H

0 0 0

68.000 68.000 68.000

65.652 0.250 65.402 64.145 0.475 65.717 0.315 65.402 64.270 0.600 65.802 0.400 65.402 64.420 0.750

63.670 63.670 63.670

4h 6g 8g

0 0.080 0.080

68.000 0.375 67.625 64.103 0.180 63.923 60.227 67.920 0.600 67.320 64.023 0.280 63.743 60.047 67.920 0.950 66.970 64.023 0.450 63.573 59.877

5H 6H 7H

0 0 0

68.000 68.000 68.000

64.403 0.300 64.103 62.135 0.630 64.478 0.375 64.103 62.305 0.800 64.578 0.475 64.103 62.505 1.000

61.505 61.505 61.505

65

68

9


max.

BS 3643-2:1981

19


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

70

72

9

10

11

12

13

14

15



Major diameter max.

© BSI 12-1998



tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

70.000 0.150 69.850 69.026 0.100 68.926 68.002 69.968 0.236 69.732 68.994 0.160 68.834 67.910 69.968 0.375 69.593 68.994 0.250 68.744 67.820

5H 6H 7H

0 0 0

70.000 70.000 70.000

69.196 0.170 69.026 68.612 0.236 69.238 0.212 69.026 68.676 0.300 69.291 0.265 69.026 68.751 0.375

68.376 68.376 68.376

2

4h 6g 8g

0 0.038 0.038

70.000 0.180 69.820 68.701 0.112 68.589 67.357 69.962 0.280 69.682 68.663 0.180 68.483 67.251 69.962 0.450 69.512 68.663 0.280 68.383 67.151

5H 6H 7H

0 0 0

70.000 70.000 70.000

68.891 0.190 68.701 68.135 0.300 68.937 0.236 68.701 68.210 0.375 69.001 0.300 68.701 68.310 0.475

67.835 67.835 67.835

3

4h 6g 8g

0 0.048 0.048

70.000 0.236 69.764 68.051 0.132 67.919 66.071 69.952 0.375 69.577 68.003 0.212 67.791 65.943 69.952 0.600 69.352 68.003 0.335 67.668 65.820

5H 6H 7H

0 0 0

70.000 70.000 70.000

68.275 0.224 68.051 67.152 0.400 68.331 0.280 68.051 67.252 0.500 68.406 0.355 68.051 67.382 0.630

66.752 66.752 66.752

4

4h 6g 8g

0 0.060 0.060

70.000 0.300 69.700 67.402 0.150 67.252 64.788 69.940 0.475 69.465 67.342 0.236 67.106 64.642 69.940 0.750 69.190 67.342 0.375 66.967 64.503

5H 6H 7H

0 0 0

70.000 70.000 70.000

67.652 0.250 67.402 66.145 0.475 67.717 0.315 67.402 66.270 0.600 67.802 0.400 67.402 66.420 0.750

65.670 65.670 65.670

6

4h 6g 8g

0 0.080 0.080

70.000 0.375 69.625 66.103 0.180 65.923 62.227 69.920 0.600 69.320 66.023 0.280 65.743 62.047 69.920 0.950 68.970 66.023 0.450 65.573 61.877

5H 6H 7H

0 0 0

70.000 70.000 70.000

66.403 0.300 66.103 64.135 0.630 66.478 0.375 66.103 64.305 0.800 66.578 0.475 66.103 64.505 1.000

63.505 63.505 63.505

1.5

4h 6g 8g

0 0.032 0.032

72.000 0.150 71.850 71.026 0.100 70.926 70.002 71.968 0.236 71.732 70.994 0.160 70.834 69.910 71.968 0.375 71.593 70.994 0.250 70.744 69.820

5H 6H 7H

0 0 0

72.000 72.000 72.000

71.196 0.170 71.026 70.612 0.236 71.238 0.212 71.026 70.676 0.300 71.291 0.265 71.026 70.751 0.375

70.376 70.376 70.376

2

4h 6g 8g

0 0.038 0.038

72.000 0.180 71.820 70.701 0.112 70.589 69.357 71.962 0.280 71.682 70.663 0.180 70.483 69.251 71.962 0.450 71.512 70.663 0.280 70.383 69.151

5H 6H 7H

0 0 0

72.000 72.000 72.000

70.891 0.190 70.701 70.135 0.300 70.937 0.236 70.701 70.210 0.375 71.001 0.300 70.701 70.310 0.475

69.835 69.835 69.835

3

4h 6g 8g

0 0.048 0.048

72.000 0.236 71.764 70.051 0.132 69.919 68.071 71.952 0.375 71.577 70.003 0.212 69.791 67.943 71.952 0.600 71.352 70.003 0.335 69.668 67.820

5H 6H 7H

0 0 0

72.000 72.000 72.000

70.275 0.224 70.051 69.152 0.400 70.331 0.280 70.051 69.252 0.500 70.406 0.355 70.051 69.382 0.630

68.752 68.752 68.752

4

4h 6g 8g

0 0.060 0.060

72.000 0.300 71.700 69.402 0.150 69.252 66.788 71.940 0.475 71.465 69.342 0.236 69.106 66.642 71.940 0.750 71.190 69.342 0.375 69.967 66.503

5H 6H 7H

0 0 0

72.000 72.000 72.000

69.652 0.250 69.402 68.145 0.475 69.717 0.315 69.402 68.270 0.600 69.802 0.400 69.402 68.420 0.750

67.670 67.670 67.670

6

4h 6g 8g

0 0.080 0.080

72.000 0.375 71.625 68.103 0.180 67.923 64.227 71.920 0.600 71.320 68.023 0.280 67.743 64.047 71.920 0.950 70.970 68.023 0.450 67.573 63.877

5H 6H 7H

0 0 0

72.000 72.000 72.000

68.403 0.300 68.103 66.135 0.630 68.478 0.375 68.103 66.305 0.800 58.578 0.475 68.103 66.505 1.000

65.505 65.505 65.505

BS 3643-2:1981

20



2

3

4

5

6

Pitch

7

8


10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g 8g

0 0.032 0.032

75.000 0.150 74.850 74.026 0.100 73.926 73.002 74.968 0.236 74.732 73.994 0.160 73.834 72.910 74.968 0.375 74.593 73.994 0.250 73.744 72.820

5H 6H 7H

0 0 0

75.000 75.000 75.000

74.196 0.170 74.026 73.612 0.236 74.238 0.212 74.026 73.676 0.300 74.291 0.265 74.026 73.751 0.375

73.376 73.376 73.376

2

4h 6g 8g

0 0.038 0.038

75.000 0.180 74.820 73.701 0.112 73.589 72.357 74.962 0.280 74.682 73.663 0.180 73.483 72.251 74.962 0.450 74.512 73.663 0.280 73.383 72.151

5H 6H 7H

0 0 0

75.000 75.000 75.000

73.891 0.190 73.701 73.135 0.300 73.937 0.236 73.701 73.210 0.375 74.001 0.300 73.701 73.310 0.475

72.835 72.835 72.835

3

4h 6g 8g

0 0.048 0.048

75.000 0.236 74.764 73.051 0.132 72.919 71.071 74.952 0.375 74.577 73.003 0.212 72.791 70.943 74.952 0.600 74.352 73.003 0.335 72.668 70.820

5H 6H 7H

0 0 0

75.000 75.000 75.000

73.275 0.224 73.051 72.152 0.400 73.331 0.280 73.051 72.252 0.500 73.406 0.355 73.051 72.382 0.630

71.752 71.752 71.752

4

4h 6g 8g

0 0.060 0.060

75.000 0.300 74.700 72.402 0.150 72.252 69.788 74.940 0.475 74.465 72.342 0.236 72.106 69.642 74.940 0.750 74.190 72.342 0.375 71.967 69.503

5H 6H 7H

0 0 0

75.000 75.000 75.000

72.652 0.250 72.402 71.145 0.475 72.717 0.315 72.402 71.270 0.600 72.802 0.400 72.402 71.420 0.750

70.670 70.670 70.670

1.5

4h 6g 8g

0 0.032 0.032

76.000 0.150 75.850 75.026 0.100 74.926 74.002 75.968 0.236 75.732 74.994 0.160 74.834 73.910 75.968 0.375 75.593 74.994 0.250 74.744 73.820

5H 6H 7H

0 0 0

76.000 76.000 76.000

75.196 0.170 75.026 74.612 0.236 75.238 0.212 75.026 74.676 0.300 75.291 0.265 75.026 74.751 0.375

74.376 74.376 74.376

2

4h 6g 8g

0 0.038 0.038

76.000 0.180 75.820 74.701 0.112 74.589 73.357 75.962 0.280 75.682 74.663 0.180 74.483 73.251 75.962 0.450 75.512 74.663 0.280 74.383 73.151

5H 6H 7H

0 0 0

76.000 76.000 76.000

74.891 0.190 74.701 74.135 0.300 74.937 0.236 74.701 74.210 0.375 75.001 0.300 74.701 74.310 0.475

73.835 73.835 73.835

3

4h 6g 8g

0 0.048 0.048

76.000 0.236 75.764 74.051 0.132 73.919 72.071 75.952 0.375 75.577 74.003 0.212 73.791 71.943 75.952 0.600 75.352 74.003 0.335 73.668 71.820

5H 6H 7H

0 0 0

76.000 76.000 76.000

74.275 0.224 74.051 73.152 0.400 74.331 0.280 74.051 73.252 0.500 74.406 0.355 74.051 73.382 0.630

72.752 72.752 72.752

4

4h 6g 8g

0 0.060 0.060

76.000 0.300 75.700 73.402 0.150 73.252 70.788 75.940 0.475 75.465 73.342 0.236 73.106 70.642 75.940 0.750 75.190 73.342 0.375 72.967 70.503

5H 6H 7H

0 0 0

76.000 76.000 76.000

73.652 0.250 73.402 72.145 0.475 73.717 0.315 73.402 72.270 0.600 73.802 0.400 73.402 72.420 0.750

71.670 71.670 71.670

6

4h 6g 8g

0 0.080 0.080

76.000 0.375 75.625 72.103 0.180 71.923 68.227 75.920 0.600 75.320 72.023 0.280 71.743 68.047 75.920 0.950 74.970 72.023 0.450 71.573 67.877

5H 6H 7H

0 0 0

76.000 76.000 76.000

72.403 0.300 72.103 70.135 0.630 72.478 0.375 72.103 70.305 0.800 72.578 0.475 72.103 70.505 1.000

69.505 69.505 69.505

2

4h 6g 8g

0 0.038 0.038

78.000 0.180 77.820 76.701 0.112 76.589 75.357 77.962 0.280 77.682 76.663 0.180 76.483 75.251 77.962 0.450 77.512 76.663 0.280 76.383 75.151

5H 6H 7H

0 0 0

78.000 78.000 78.000

76.891 0.190 76.701 76.135 0.300 76.937 0.236 76.701 76.210 0.375 77.001 0.300 76.701 76.310 0.475

75.835 75.835 75.835

78

BS 3643-2:1981

1.5

75

76

9


max.

21


© BSI 12-1998


1 Nominal diameter

2

3

4

5

Pitch

6

7

80

82

8

9

10

11

12

13

14

15



tol.

16

17

18

19

20

21

22


Major diameter max.

min.

Pitch diameter max.

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

1.5

4h 6g 8g

0 0.032 0.032

80.000 0.150 79.850 79.026 0.100 78.926 78.002 79.968 0.236 79.732 78.994 0.160 78.834 77.910 79.968 0.375 79.593 78.994 0.250 78.774 77.820

5H 6H 7H

0 0 0

80.000 80.000 80.000

79.196 0.170 79.026 78.612 0.236 79.238 0.212 79.026 78.676 0.300 79.291 0.265 79.026 78.751 0.375

78.376 78.376 78.376

2

4h 6g 8g

0 0.038 0.038

80.000 0.180 79.820 78.701 0.112 78.589 77.357 79.962 0.280 79,682 78.663 0.180 78.483 77.251 79.962 0.450 79.512 78.663 0.280 78.383 77.151

5H 6H 7H

0 0 0

80.000 80.000 80.000

78.891 0.190 78.701 78.135 0.300 78.937 0.236 78.701 78.210 0.375 79.001 0.300 78.701 78.310 0.475

77.835 77.835 77.835

3

4h 6g 8g

0 0.048 0.048

80.000 0.236 79.764 78.051 0.132 77.919 76.071 79.952 0.375 79.577 78.003 0.212 77.791 75.943 79.952 0.600 79.352 78.003 0.335 77.668 75.820

5H 6H 7H

0 0 0

80.000 80.000 80.000

78.275 0.224 78.051 77.152 0.400 78.331 0.280 78.051 77.252 0.500 78.406 0.355 78.051 77.382 0.630

76.752 76.752 76.752

4

4h 6g 8g

0 0.060 0.060

80.000 0.300 79.700 77.402 0.150 77.252 74.788 79.940 0.475 79.465 77.342 0.236 77.106 74.642 79.940 0.750 79.190 77.342 0.375 76.967 74.503

5H 6H 7H

0 0 0

80.000 80.000 80.000

77.652 0.250 77.402 76.145 0.475 77.717 0.315 77.402 76.270 0.600 77.802 0.400 77.402 76.420 0.750

75.670 75.670 75.670

6

4h 6g 8g

0 0.080 0.080

80.000 0.375 79.625 76.103 0.180 75.923 72.227 79.920 0.600 79.320 76.023 0.280 75.743 72.047 79.920 0.950 78.970 76.023 0.450 75.573 71.877

5H 6H 7H

0 0 0

80.000 80.000 80.000

76.403 0.300 76.103 74.135 0.630 76.478 0.375 76.103 74.305 0.800 76.578 0.475 76.103 74.505 1.000

73.505 73.505 73.505

2

4h 6g 8g

0 0.038 0.038

82.000 0.180 81.820 80.701 0.112 80.589 79.357 81.962 0.280 81.682 80.663 0.180 80.483 79.251 81.962 0.450 81.512 80.663 0.280 80.383 79.151

5H 6H 7H

0 0 0

82.000 82.000 82.000

80.891 0.190 80.701 80.135 0.300 80.937 0.236 80.701 80.210 0.375 81.001 0.300 80.701 80.310 0.475

79.835 79.835 79.835

2

4h 6g 8g

0 0.038 0.038

85.000 0.180 84.820 83.701 0.112 83.589 82.357 84.962 0.280 84.682 83.663 0.180 83.483 82.251 84.962 0.450 84.512 83.663 0.280 83.383 82.151

5H 6H 7H

0 0 0

85.000 85.000 85.000

83.891 0.190 83.701 83.135 0.300 83.937 0.236 83.701 83.210 0.375 84.001 0.300 83.701 83.310 0.475

82.835 82.835 82.835

3

4h 6g 8g

0 0.048 0.048

85.000 0.236 84.764 83.051 0.132 82.919 81.071 84.952 0.375 84.577 83.003 0.212 82.791 80.943 84.952 0.600 84.352 83.003 0.335 82.668 80.820

5H 6H 7H

0 0 0

85.000 85.000 85.000

83.275 0.224 83.051 82.152 0.400 83.331 0.280 83.051 82.252 0.500 83.406 0.355 83.051 82.382 0.630

81.752 81.752 81.752

4

4h 6g 8g

0 0.060 0.060

85.000 0.300 84.700 82.402 0.150 82.252 79.788 84.940 0.475 84.465 82.342 0.236 82.106 79.642 84.940 0.750 84.190 82.342 0.375 81.967 79.503

5H 6H 7H

0 0 0

85.000 85.000 85.000

82.652 0.250 82.402 81.145 0.475 82.717 0.315 82.402 81.270 0.600 82.802 0.400 82.402 81.420 0.750

80.670 80.670 80.670

6

4h 6g 8g

0 0.080 0.080

85.000 0.375 84.625 81.103 0.180 80.923 77.227 84.920 0.600 84.320 81.023 0.280 80.743 77.047 84.920 0.950 84.970 81.023 0.450 81.573 76.877

5H 6H 7H

0 0 0

85.000 85.000 85.000

81.403 0.300 81.103 79.135 0.630 81.478 0.375 81.103 79.305 0.800 81.578 0.475 81.103 79.505 1.000

78.505 78.505 78.505

85

© BSI 12-1998



BS 3643-2:1981

22



2

3

4

5

Pitch

6

7

8

9

10

11

12

13

14

15



tol.

16

17

18

19

20

21

22


Major diameter max.

min.

Pitch diameter max.

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

2

4h 6g 8g

0 0.038 0.038

90.000 0.180 89.820 88.701 0.112 88.589 87.357 89.962 0.280 89.682 88.663 0.180 88.483 87.251 89.962 0.450 89.512 88.663 0.280 88.383 87.151

5H 6H 7H

0 0 0

90.000 90.000 90.000

88.891 0.190 88.701 88.135 0.300 88.937 0.236 88.701 88.210 0.375 89.001 0.300 88.701 88.310 0.475

87.835 87.835 87.835

3

4h 6g 8g

0 0.048 0.048

90.000 0.236 89.764 88.051 0.132 87.919 86.071 89.952 0.375 89.577 88.003 0.212 87.791 85.943 89.952 0.600 89.352 88.003 0.335 87.668 85.820

5H 6H 7H

0 0 0

90.000 90.000 90.000

88.275 0.224 88.051 87.152 0.400 88.331 0.280 88.051 87.252 0.500 88.406 0.355 88.051 87.382 0.630

86.752 86.752 86.752

4

4h 6g 8g

0 0.060 0.060

90.000 0.300 89.700 87.402 0.150 87.252 84.788 89.940 0.475 89.465 87.342 0.236 87.106 84.642 89.940 0.750 89.190 87.342 0.375 86.967 84.503

5H 6H 7H

0 0 0

90.000 90.000 90.000

87.652 0.250 87.402 86.145 0.475 87.717 0.315 87.402 86.270 0.600 87.802 0.400 87.402 86.420 0.750

85.670 85.670 85.670

6

4h 6g 8g

0 0.080 0.080

90.000 0.375 89.625 86.103 0.180 85.923 82.227 89.920 0.600 89.320 86.023 0.280 85.743 82.047 89.920 0.950 88.970 86.023 0.450 85.573 81.877

5H 6H 7H

0 0 0

90.000 90.000 90.000

86.403 0.300 86.103 84.135 0.630 86.478 0.375 86.103 84.305 0.800 86.578 0.475 86.103 84.505 1.000

83.505 83.505 83.505

2

4h 6g 8g

0 0.038 0.038

95.000 0.180 94.820 93.701 0.118 93.583 92.351 94.962 0.280 94.682 93.663 0.190 93.473 92.241 94.962 0.450 94.512 93.663 0.300 93.363 92.131

5H 6H 7H

0 0 0

95.000 95.000 95.000

93.901 0.200 93.701 93.135 0.300 93.951 0.250 93.701 93.210 0.375 94.016 0.315 93.701 93.310 0.475

92.835 92.835 92.835

3

4h 6g 8g

0 0.048 0.048

95.000 0.236 94.764 93.051 0.140 92.911 91.063 94.952 0.375 94.577 93.003 0.224 92.779 90.931 94.952 0.600 94.352 93.003 0.355 92.648 90.800

5H 6H 7H

0 0 0

95.000 95.000 95.000

93.287 0.236 93.051 92.152 0.400 93.351 0.300 93.051 92.252 0.500 93.426 0.375 93.051 92.382 0.630

91.752 91.752 91.752

4

4h 6g 8g

0 0.060 0.060

95.000 0.300 94.700 92.402 0.160 92.242 89.778 94.940 0.475 94.465 92.342 0.250 92.092 89.628 94.940 0.750 94.190 92.342 0.400 91.942 89.478

5H 6H 7H

0 0 0

95.000 95.000 95.000

92.667 0.265 92.402 91.145 0.475 92.737 0.335 92.402 91.270 0.600 92.827 0.425 92.402 91.420 0.750

90.670 90.670 90.670

6

4h 6g 8g

0 0.080 0.080

95.000 0.375 94.625 91.103 0.190 90.913 87.217 94.920 0.600 94.320 91.023 0.300 90.723 87.027 94.920 0.950 93.970 91.023 0.475 90.548 86.852

5H 6H 7H

0 0 0

95.000 95.000 95.000

91.418 0.315 91.103 89.135 0.630 91.503 0.400 91.103 89.305 0.800 91.603 0.500 91.103 89.505 1.000

88.505 88.505 88.505

90

95

BS 3643-2:1981

23


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

2

4h 6g 8g

0 100.000 0.180 99.820 98.701 0.118 98.583 97.351 0.038 99.962 0.280 99.682 98.663 0.190 98.473 97.241 0.038 99.962 0.450 99.512 98.663 0.300 98.363 97.131

5H 6H 7H

0 0 0

100.000 100.000 100.000

98.901 0.200 98.701 98.135 0.300 98.951 0.250 98.701 98.210 0.375 99.016 0.315 98.701 98.310 0.475

97.835 97.835 97.835

3

4h 6g 8g

0 100.000 0.236 99.764 98.051 0.140 97.911 96.063 0.048 99.952 0.375 99.577 98.003 0.224 97.779 95.931 0.048 99.952 0.600 99.352 98.003 0.355 97.648 95.800

5H 6H 7H

0 0 0

100.000 100.000 100.000

98.287 0.236 98.051 97.152 0.400 98.351 0.300 98.051 97.252 0.500 98.426 0.375 98.051 97.382 0.630

96.752 96.752 96.752

4

4h 6g 8g

0 100.000 0.300 99.700 97.402 0.160 97.242 94.778 0.060 99.940 0.475 99.465 97.342 0.250 97.092 94.628 0.060 99.940 0.750 99.190 97.342 0.400 96.942 94.478

5H 6H 7H

0 0 0

100.000 100.000 100.000

97.667 0.265 97.402 96.145 0.475 97.737 0.335 97.402 96.270 0.600 97.827 0.425 97.402 96.420 0.750

95.670 95.670 95.670

6

4h 6g 8g

0 100.000 0.375 99.625 96.103 0.190 95.913 92.217 0.080 99.920 0.600 99.320 96.023 0.300 95.723 92.027 0.080 99.920 0.950 98.970 96.023 0.475 95.548 91.852

5H 6H 7H

0 0 0

100.000 100.000 100.000

96.418 0.315 96.103 94.135 0.630 96.503 0.400 96.103 94.305 0.800 96.603 0.500 96.103 94.505 1.000

93.505 93.505 93.505

2

4h 6g 8g

0 105.000 0.180 104.820 103.701 0.118 103.583 102.351 0.038 104.962 0.280 104.682 103.663 0.190 103.473 102.241 0.038 104.962 0.450 104.512 103.663 0.300 103.363 102.131

5H 6H 7H

0 0 0

105.000 105.000 105.000

103.901 0.200 103.701 103.135 0.300 102.835 103.951 0.250 103.701 103.210 0.375 102.835 104.016 0.315 103.701 103.310 0.475 102.835

3

4h 6g 8g

0 105.000 0.236 104.764 103.051 0.140 102.911 101.063 0.048 104.952 0.375 104.577 103.003 0.224 102.779 100.931 0.048 104.952 0.600 104.352 103.003 0.355 102.648 100.800

5H 6H 7H

0 0 0

105.000 105.000 105.000

103.287 0.236 103.051 102.152 0.400 101.752 103.351 0.300 103.051 102.252 0.500 101.752 103.426 0.375 103.051 102.382 0.630 101.752

4

4h 6g 8g

0 105.000 0.300 104.700 102.402 0.160 102.242 99.778 0.060 104.940 0.475 104.465 102.342 0.250 102.092 99.628 0.060 104.940 0.750 104.190 102.342 0.400 101.942 99.478

5H 6H 7H

0 0 0

105.000 105.000 105.000

102.667 0.265 102.402 101.145 0.475 100.670 102.737 0.335 102.402 101.270 0.600 100.670 102.827 0.425 102.402 101.420 0.750 100.670

6

4h 6g 8g

0 105.000 0.375 104.625 101.103 0.190 100.913 97.217 0.080 104.920 0.600 104.320 101.023 0.300 100.723 97.027 0.080 104.920 0.950 103.970 101.023 0.475 100.548 96.852

5H 6H 7H

0 0 0

105.000 105.000 105.000

101.418 0.315 101.103 99.135 0.630 101.503 0.400 101.103 99.305 0.800 101.603 0.500 101.103 99.505 1.000

100

105

© BSI 12-1998



98.505 98.505 98.505

BS 3643-2:1981

24



2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

2

4h 6g 8g

0 110.000 0.180 109.820 108.701 0.118 108.583 107.351 0.038 109.962 0.280 109.682 108.663 0.190 108.473 107.241 0.038 109.962 0.450 109.512 108.663 0.300 108.363 107.131

5H 6H 7H

0 0 0

110.000 110.000 110.000

108.901 0.200 108.701 108.135 0.300 107.835 108.951 0.250 108.701 108.210 0.375 107.835 109.016 0.315 108.701 108.310 0.475 107.835

3

4h 6g 8g

0 110.000 0.236 109.764 108.051 0.140 107.911 106.063 0.048 109.952 0.375 109.577 108.003 0.224 107.779 105.931 0.048 109.952 0.600 109.352 108.003 0.355 107.648 105.800

5H 6H 7H

0 0 0

110.000 110.000 110.000

108.287 0.236 108.051 107.152 0.400 106.752 108.351 0.300 108.051 107.252 0.500 106.752 108.426 0.375 108.051 107.382 0.630 106.752

4

4h 6g 8g

0 110.000 0.300 109.700 107.402 0.160 107.242 104.778 0.060 109.940 0.475 109.465 107.342 0.250 107.092 104.628 0.060 109.940 0.750 109.190 107.342 0.400 106.942 104.478

5H 6H 7H

0 0 0

110.000 110.000 110.000

107.667 0.265 107.402 106.145 0.475 105.670 107.737 0.335 107.402 106.270 0.600 105.670 107.827 0.425 107.402 106.420 0.750 105.670

6

4h 6g 8g

0 110.000 0.375 109.625 106.103 0.190 105.913 102.217 0.080 109.920 0.600 109.320 106.023 0.300 105.723 102.027 0.080 109.920 0.950 108.970 106.023 0.475 105.548 101.852

5H 6H 7H

0 0 0

110.000 110.000 110.000

106.418 0.315 106.103 104.135 0.630 103.505 106.503 0.400 106.103 104.305 0.800 103.505 106.603 0.500 106.103 104.505 1.000 103.505

2

4h 6g 8g

0 115.000 0.180 114.820 113.701 0.118 113.583 112.351 0.038 114.962 0.280 114.682 113.663 0.190 113.473 112.241 0.038 114.962 0.450 114.512 113.663 0.300 113.363 112.131

5H 6H 7H

0 0 0

115.000 115.000 115.000

113.901 0.200 113.701 113.135 0.300 112.835 113.951 0.250 113.701 113.210 0.375 112.835 114.016 0.315 113.701 113.310 0.475 112.835

3

4h 6g 8g

0 115.000 0.236 114.764 113.051 0.140 112.911 111.063 0.048 114.952 0.375 114.577 113.003 0.224 112.779 110.931 0.048 114.952 0.600 114.352 113.003 0.355 112.648 110.800

5H 6H 7H

0 0 0

115.000 115.000 115.000

113.287 0.236 113.051 112.152 0.400 111.752 113.351 0.300 113.051 112.252 0.500 111.752 113.426 0.375 113.051 112.382 0.630 111.752

4

4h 6g 8g

0 115.00 0.300 114.700 112.402 0.160 112.242 109.778 0.060 114.940 0.475 114.465 112.342 0.250 112.092 109.628 0.060 114.940 0.750 114.190 112.342 0.400 111.942 109.478

5H 6H 7H

0 0 0

115.000 115.000 115.000

112.667 0.265 112.402 111.145 0.475 110.670 112.737 0.335 112.402 111.270 0.600 110.670 112.827 0.425 112.402 111.420 0.750 110.670

6

4h 6g 8g

0 115.000 0.375 114.625 111.103 0.190 110.913 107.217 0.080 114.920 0.600 114.320 111.023 0.300 110.723 107.027 0.080 114.920 0.950 113.970 111.023 0.475 110.548 106.852

5H 6H 7H

0 0 0

115.000 115.000 115.000

111.418 0.315 111.103 109.135 0.630 108.505 111.503 0.400 111.103 109.305 0.800 108.505 111.603 0.500 111.103 109.505 1.000 108.505

110

115

BS 3643-2:1981

25


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

2

4h 6g 8g

0 120.000 0.180 119.820 118.701 0.118 118.583 117.351 0.038 119.962 0.280 119.682 118.663 0.190 118.473 117.241 0.038 119.962 0.450 119.512 118.663 0.300 118.363 117.131

5H 6H 7H

0 0 0

120.000 120.000 120.000

118.901 0.200 118.701 118.135 0.300 117.835 118.951 0.250 118.701 118.210 0.375 117.835 119.016 0.315 118.701 118.310 0.475 117.835

3

4h 6g 8g

0 120.000 0.236 119.764 118.051 0.140 117.911 116.063 0.048 119.952 0.375 119.577 118.003 0.224 117.779 115.931 0.048 119.952 0.600 119.352 118.003 0.355 117.648 115.800

5H 6H 7H

0 0 0

120.000 120.000 120.000

118.287 0.236 118.051 117.152 0.400 116.752 118.351 0.300 118.051 117.252 0.500 116.752 118.426 0.375 118.051 117.382 0.630 116.752

4

4h 6g 8g

0 120.000 0.300 119.700 117.402 0.160 117.242 114.778 0.060 119.940 0.475 119.465 117.342 0.250 117.092 114.628 0.060 119.940 0.750 119.190 117.342 0.400 116.942 114.478

5H 6H 7H

0 0 0

120.000 120.000 120.000

117.667 0.265 117.402 116.145 0.475 115.670 117.737 0.335 117.402 116.270 0.600 115.670 117.827 0.425 117.402 116.420 0.750 115.670

6

4h 6g 8g

0 120.000 0.375 119.625 116.103 0.190 115.913 112.217 0.080 119.920 0.600 119.320 116.023 0.300 115.723 112.027 0.080 119.920 0.950 118.970 116.023 0.475 115.548 111.852

5H 6H 7H

0 0 0

120.000 120.000 120.000

116.418 0.315 116.103 114.135 0.630 113.505 116.503 0.400 116.103 114.305 0.800 113.505 116.603 0.500 116.103 114.505 1.000 113.505

2

4h 6g 8g

0 125.000 0.180 124.820 123.701 0.118 123.583 122.351 0.038 124.962 0.280 124.682 123.663 0.190 123.473 122.241 0.038 124.962 0.450 124.512 123.663 0.300 123.363 122.131

5H 6H 7H

0 0 0

125.000 125.000 125.000

123.901 0.200 123.701 123.135 0.300 122.835 123.951 0.250 123.701 123.210 0.375 122.835 124.016 0.315 123.701 123.310 0.475 122.835

3

4h 6g 8g

0 125.000 0.236 124.764 123.051 0.140 122.911 121.063 0.048 124.952 0.375 124.577 123.003 0.224 122.779 120.931 0.048 124.952 0.600 124.352 123.003 0.355 122.648 120.800

5H 6H 7H

0 0 0

125.000 125.000 125.000

123.287 0.236 123.051 122.152 0.400 121.752 123.351 0.300 123.051 122.252 0.500 121.752 123.426 0.375 123.051 122.382 0.630 121.752

4

4h 6g 8g

0 125.000 0.300 124.700 122.402 0.160 122.242 119.778 0.060 124.940 0.475 124.465 122.342 0.250 122.092 119.628 0.060 124.940 0.750 124.190 122.342 0.400 121.942 119.478

5H 6H 7H

0 0 0

125.000 125.000 125.000

122.667 0.265 122.402 121.145 0.475 120.670 122.737 0.335 122.402 121.270 0.600 120.670 122.827 0.425 122.402 121.420 0.750 120.670

6

4h 6g 8g

0 125.000 0.375 124.625 121.103 0.190 120.913 117.217 0.080 124.920 0.600 124.320 121.023 0.300 120.723 117.027 0.080 124.920 0.950 123.970 121.023 0.475 120.548 116.852

5H 6H 7H

0 0 0

125.000 125.000 125.000

121.418 0.315 121.103 119.135 0.630 118.505 121.503 0.400 121.103 119.305 0.800 118.505 121.603 0.500 121.103 119.505 1.000 118.505

120

125

© BSI 12-1998



BS 3643-2:1981

26



2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

2

4h 6g 8g

0 130.000 0.180 129.820 128.701 0.118 128.583 127.351 0.038 129.962 0.280 129.682 128.663 0.190 128.473 127.241 0.038 129.962 0.450 129.512 128.663 0.300 128.363 127.131

5H 6H 7H

0 0 0

130.000 130.000 130.000

128.901 0.200 128.701 128.135 0.300 127.835 128.951 0.250 128.701 128.210 0.375 127.835 129.016 0.315 128.701 128.310 0.475 127.835

3

4h 6g 8g

0 130.000 0.236 129.764 128.051 0.140 127.911 126.063 0.048 129.952 0.375 129.577 128.003 0.224 127.779 125.931 0.048 129.952 0.600 129.352 128.003 0.355 127.648 125.800

5H 6H 7H

0 0 0

130.000 130.000 130.000

128.287 0.236 128.051 127.152 0.400 126.752 128.351 0.300 128.051 127.252 0.500 126.752 128.426 0.375 128.051 127.382 0.630 126.752

4

4h 6g 8g

0 130.000 0.300 129.700 127.402 0.160 127.242 124.778 0.060 129.940 0.475 129.465 127.342 0.250 127.092 124.628 0.060 129.940 0.750 129.190 127.342 0.400 126.942 124.478

5H 6H 7H

0 0 0

130.000 130.000 130.000

127.667 0.265 127.402 126.145 0.475 125.670 127.737 0.335 127.402 126.270 0.600 125.670 127.827 0.425 127.402 126.420 0.750 125.670

6

4h 6g 8g

0 130.000 0.375 129.625 126.103 0.190 125.913 122.217 0.080 129.920 0.600 129.320 126.023 0.300 125.723 122.027 0.080 129.920 0.950 128.970 126.023 0.475 125.548 121.852

5H 6H 7H

0 0 0

130.000 130.000 130.000

126.418 0.315 126.103 124.135 0.630 123.505 126.503 0.400 126.103 124.305 0.800 123.505 126.603 0.500 126.103 124.505 1.000 123.505

2

4h 6g 8g

0 135.000 0.180 134.820 133.701 0.118 133.583 132.351 0.038 134.962 0.280 134.682 133.663 0.190 133.473 132.241 0.038 134.962 0.450 134.512 133.663 0.300 133.363 132.131

5H 6H 7H

0 0 0

135.000 135.000 135.000

133.901 0.200 133.701 133.135 0.300 132.835 133.951 0.250 133.701 133.210 0.375 132.835 134.016 0.315 133.701 133.310 0.475 132.835

3

4h 6g 8g

0 135.000 0.236 134.764 133.051 0.140 132.911 131.063 0.048 134.952 0.375 134.577 133.003 0.224 132.779 130.931 0.048 134.952 0.600 134.352 133.003 0.355 132.648 130.800

5H 6H 7H

0 0 0

135.000 135.000 135.000

133.287 0.236 133.051 132.152 0.400 131.752 133.351 0.300 133.051 132.252 0.500 131.752 133.426 0.375 133.051 132.382 0.630 131.752

4

4h 6g 8g

0 135.000 0.300 134.700 132.402 0.160 132.242 129.778 0.060 134.940 0.475 134.465 132.342 0.250 132.092 129.628 0.060 134.940 0.750 134.190 132.342 0.400 131.942 129.478

5H 6H 7H

0 0 0

135.000 135.000 135.000

132.667 0.265 132.402 131.145 0.475 130.670 132.737 0.335 132.402 131.270 0.600 130.670 132.827 0.425 132.402 131.420 0.750 130.670

6

4h 6g 8g

0 135.000 0.375 134.625 131.103 0.190 130.913 127.217 0.080 134.920 0.600 134.320 131.023 0.300 130.723 127.027 0.080 134.920 0.950 133.970 131.023 0.475 130.548 126.852

5H 6H 7H

0 0 0

135.000 135.000 135.000

131.418 0.315 131.103 129.135 0.630 128.505 131.503 0.400 131.103 129.305 0.800 128.505 131.603 0.500 131.103 129.505 1.000 128.505

130

135

BS 3643-2:1981

27


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

2

4h 6g 8g

0 140.000 0.180 139.820 138.701 0.118 138.583 137.351 0.038 139.962 0.280 139.682 138.663 0.190 138.473 137.241 0.038 139.962 0.450 139.512 138.663 0.300 138.363 137.131

5H 6H 7H

0 0 0

140.000 140.000 140.000

138.901 0.200 138.701 138.135 0.300 137.835 138.951 0.250 138.701 138.210 0.375 137.835 139.016 0.315 138.701 138.310 0.475 137.835

3

4h 6g 8g

0 140.000 0.236 139.764 138.051 0.140 137.911 136.063 0.048 139.952 0.375 139.577 138.003 0.224 137.779 135.931 0.048 139.952 0.600 139.352 138.003 0.355 137.648 135.800

5H 6H 7H

0 0 0

140.000 140.000 140.000

138.287 0.236 138.051 137.152 0.400 136.752 138.351 0.300 138.051 137.252 0.500 136.752 138.426 0.375 138.051 137.382 0.630 136.752

4

4h 6g 8g

0 140.000 0.300 139.700 137.402 0.160 137.242 134.778 0.060 139.940 0.475 139.465 137.342 0.250 137.092 134.628 0.060 139.940 0.750 139.190 137.342 0.400 136.942 134.478

5H 6H 7H

0 0 0

140.000 140.000 140.000

137.667 0.265 137.402 136.145 0.475 135.670 137.737 0.335 137.402 136.270 0.600 135.670 137.827 0.425 137.402 136.420 0.750 135.670

6

4h 6g 8g

0 140.000 0.375 139.625 136.103 0.190 135.913 132.217 0.080 139.920 0.600 139.320 136.023 0.300 135.723 132.027 0.080 139.920 0.950 138.970 136.023 0.475 135.548 131.852

5H 6H 7H

0 0 0

140.000 140.000 140.000

136.418 0.315 136.103 134.135 0.630 133.505 136.503 0.400 136.103 134.305 0.800 133.505 136.603 0.500 136.103 134.505 1.000 133.505

2

4h 6g 8g

0 145.000 0.180 144.820 143.701 0.118 143.583 142.351 0.038 144.962 0.280 144.682 143.663 0.190 143.473 142.241 0.038 144.962 0.450 144.512 143.663 0.300 143.363 142.131

5H 6H 7H

0 0 0

145.000 145.000 145.000

143.901 0.200 143.701 143.135 0.300 142.835 143.951 0.250 143.701 143.210 0.375 142.835 144.016 0.315 143.701 143.310 0.475 142.835

3

4h 6g 8g

0 145.000 0.236 144.764 143.051 0.140 142.911 141.063 0.048 144.952 0.375 144.577 143.003 0.224 142.779 140.931 0.048 144.952 0.600 144.352 143.003 0.355 142.648 140.800

5H 6H 7H

0 0 0

145.000 145.000 145.000

143.287 0.236 143.051 142.152 0.400 141.752 143.351 0.300 143.051 142.252 0.500 141.752 143.426 0.375 143.051 142.382 0.630 141.752

4

4h 6g 8g

0 145.000 0.300 144.700 142.402 0.160 142.242 139.778 0.060 144.940 0.475 144.465 142.342 0.250 142.092 139.628 0.060 144.940 0.750 144.190 142.342 0.400 141.942 139.478

5H 6H 7H

0 0 0

145.000 145.000 145.000

142.667 0.265 142.402 141.145 0.475 140.670 142.737 0.335 142.402 141.270 0.600 140.670 142.827 0.425 142.402 141.420 0.750 140.670

6

4h 6g 8g

0 145.000 0.375 144.625 141.103 0.190 140.913 137.217 0.080 144.920 0.600 144.320 141.023 0.300 140.723 137.027 0.080 144.920 0.950 143.970 141.023 0.475 140.548 136.852

5H 6H 7H

0 0 0

145.000 145.000 145.000

141.418 0.315 141.103 139.135 0.630 138.505 141.503 0.400 141.103 139.305 0.800 138.505 141.603 0.500 141.103 139.505 1.000 138.505

140

145

© BSI 12-1998



BS 3643-2:1981

28



2

3

4

5

6

Pitch

7

8


160

10

11

12

13

14

15

Major diameter tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g 8g

0 150.000 0.180 149.820 148.701 0.118 148.583 147.351 0.038 149.962 0.280 149.682 148.663 0.190 148.473 147.241 0.038 149.962 0.450 149.512 148.663 0.300 148.363 147.131

5H 6H 7H

0 0 0

150.000 150.000 150.000

148.901 0.200 148.701 148.135 0.300 147.835 148.951 0.250 148.701 148.210 0.375 147.835 149.016 0.315 148.701 148.310 0.475 147.835

3

4h 6g 8g

0 150.000 0.236 149.764 148.051 0.140 147.911 146.063 0.048 149.952 0.375 149.577 148.003 0.224 147.779 145.931 0.048 149.952 0.600 149.352 148.003 0.355 147.648 145.800

5H 6H 7H

0 0 0

150.000 150.000 150.000

148.287 0.236 148.051 147.152 0.400 146.752 148.351 0.300 148.051 147.252 0.500 146.752 148.426 0.375 148.051 147.382 0.630 146.752

4

4h 6g 8g

0 150.000 0.300 149.700 147.402 0.160 147.242 144.778 0.060 149.940 0.475 149.465 147.342 0.250 147.092 144.628 0.060 149.940 0.750 149.190 147.342 0.400 146.942 144.478

5H 6H 7H

0 0 0

150.000 150.000 150.000

147.667 0.265 147.402 146.145 0.475 145.670 147.737 0.335 147.402 146.270 0.600 145.670 147.827 0.425 147.402 146.420 0.750 145.670

6

4h 6g 8g

0 150.000 0.375 149.625 146.103 0.190 145.913 142.217 0.080 149.920 0.600 149.320 146.023 0.300 145.723 142.027 0.080 149.920 0.950 148.970 146.023 0.475 145.548 141.852

5H 6H 7H

0 0 0

150.000 150.000 150.000

146.418 0.315 146.103 144.135 0.630 143.505 146.503 0.400 146.103 144.305 0.800 143.505 146.603 0.500 146.103 144.505 1.000 143.505

3

4h 6g 8g

0 155.000 0.236 154.764 153.051 0.140 152.911 151.063 0.048 154.952 0.375 154.577 153.003 0.224 152.779 150.931 0.048 154.952 0.600 154.352 153.003 0.355 152.648 150.800

5H 6H 7H

0 0 0

155.000 155.000 155.000

153.287 0.236 153.051 152.152 0.400 151.752 153.351 0.300 153.051 152.252 0.500 151.752 153.426 0.375 153.051 152.382 0.630 151.752

4

4h 6g 8g

0 155.000 0.300 154.700 152.402 0.160 152.242 149.778 0.060 154.940 0.475 154.465 152.342 0.250 152.092 149.628 0.060 154.940 0.750 154.190 152.342 0.400 151.942 149.478

5H 6H 7H

0 0 0

155.000 155.000 155.000

152.667 0.265 152.402 151.145 0.475 150.670 152.737 0.335 152.402 151.270 0.600 150.670 152.827 0.425 152.402 151.420 0.750 150.670

6

4h 6g 8g

0 155.000 0.375 154.625 151.103 0.190 150.913 147.217 0.080 154.920 0.600 154.320 151.023 0.300 150.723 147.027 0.080 154.920 0.950 153.970 151.023 0.475 150.548 146.852

5H 6H 7H

0 0 0

155.000 155.000 155.000

151.418 0.315 151.103 149.135 0.630 148.505 151.503 0.400 151.103 149.305 0.800 148.505 151.603 0.500 151.103 149.505 1.000 148.505

3

4h 6g 8g

0 160.000 0.236 159.764 158.051 0.140 157.911 156.063 0.048 159.952 0.375 159.577 158.003 0.224 157.779 155.931 0.048 159.952 0.600 159.352 158.003 0.355 157.648 155.800

5H 6H 7H

0 0 0

160.000 160.000 160.000

158.287 0.236 158.051 157.152 0.400 156.752 158.351 0.300 158.051 157.252 0.500 156.752 158.426 0.375 158.051 157.382 0.630 156.752

4

4h 6g 8g

0 160.000 0.300 159.700 157.402 0.160 157.242 154.778 0.060 159.940 0.475 159.465 157.342 0.250 157.092 154.628 0.060 159.940 0.750 159.190 157.342 0.400 156.942 154.478

5H 6H 7H

0 0 0

160.000 160.000 160.000

157.667 0.265 157.402 156.145 0.475 155.670 157.737 0.335 157.402 156.270 0.600 155.670 157.827 0.425 157.402 156.420 0.750 155.670

6

4h 6g 8g

0 160.000 0.375 159.625 156.103 0.190 155.913 152.217 0.080 159.920 0.600 159.320 156.023 0.300 155.723 152.027 0.080 159.920 0.950 158.970 156.023 0.475 155.548 151.852

5H 6H 7H

0 0 0

160.000 160.000 160.000

156.418 0.315 156.103 154.135 0.630 153.505 156.503 0.400 156.103 154.305 0.800 153.505 156.603 0.500 156.103 154.505 1.000 153.505

BS 3643-2:1981

2

150

155

9


max.

29


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

165

170

175

9

10

11

12

13

14

15



Major diameter max.

© BSI 12-1998



tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

3

4h 6g 8g

0 165.000 0.236 164.764 163.051 0.140 162.911 161.063 0.048 164.952 0.375 164.577 163.003 0.224 162.779 160.931 0.048 164.952 0.600 164.352 163.003 0.355 162.648 160.800

5H 6H 7H

0 0 0

165.000 165.000 165.000

163.287 0.236 163.051 162.152 0.400 161.752 163.351 0.300 163.051 162.252 0.500 161.752 163.426 0.375 163.051 162.382 0.630 161.752

4

4h 6g 8g

0 165.000 0.300 164.700 162.402 0.160 162.242 159.778 0.060 164.940 0.475 164.465 162.342 0.250 162.092 159.628 0.060 164.940 0.750 164.190 162.342 0.400 161.942 159.478

5H 6H 7H

0 0 0

165.000 165.000 165.000

162.667 0.265 162.402 161.145 0.475 160.670 162.737 0.335 162.402 161.270 0.600 160.670 162.827 0.425 162.402 161.420 0.750 160.670

6

4h 6g 8g

0 165.000 0.375 164.625 161.103 0.190 160.913 157.217 0.080 164.920 0.600 164.320 161.023 0.300 160.723 157.027 0.080 164.920 0.950 163.970 161.023 0.475 160.548 156.852

5H 6H 7H

0 0 0

165.000 165.000 165.000

161.418 0.315 161.103 159.135 0.630 158.505 161.503 0.400 161.103 159.305 0.800 158.505 161.603 0.500 161.103 159.505 1.000 158.505

3

4h 6g 8g

0 170.000 0.236 169.764 168.051 0.140 167.911 166.063 0.048 169.952 0.375 169.577 168.003 0.224 167.779 165.931 0.048 169.952 0.600 169.352 168.003 0.355 167.648 165.800

5H 6H 7H

0 0 0

170.000 170.000 170.000

168.287 0.236 168.051 167.152 0.400 166.752 168.351 0.300 168.051 167.252 0.500 166.752 168.426 0.375 168.051 167.382 0.630 166.752

4

4h 6g 8g

0 170.000 0.300 169.700 167.402 0.160 167.242 164.778 0.060 169.940 0.475 169.465 167.342 0.250 167.092 164.628 0.060 169.940 0.750 169.190 167.342 0.400 166.942 164.478

5H 6H 7H

0 0 0

170.000 170.000 170.000

167.667 0.265 167.402 166.145 0.475 165.670 167.737 0.335 167.042 166.270 0.600 165.670 167.827 0.425 167.402 166.420 0.750 165.670

6

4h 6g 8g

0 170.000 0.375 169.625 166.103 0.190 165.913 162.217 0.080 169.920 0.600 169.320 166.023 0.300 165.723 162.027 0.080 169.920 0.950 168.970 166.023 0.475 165.548 161.852

5H 6H 7H

0 0 0

170.000 170.000 170.000

166.418 0.315 166.103 164.135 0.630 163.505 166.503 0.400 166.103 164.305 0.800 163.505 166.603 0.500 166.103 164.505 1.000 163.505

3

4h 6g 8g

0 175.000 0.236 174.764 173.051 0.140 172.911 171.063 0.048 174.952 0.375 174.577 173.003 0.224 172.779 170.931 0.048 174.952 0.600 174.352 173.003 0.355 172.648 170.800

5H 6H 7H

0 0 0

175.000 175.000 175.000

173.287 0.236 173.051 172.152 0.400 171.752 173.351 0.300 173.051 172.252 0.500 171.752 173.426 0.375 173.051 172.382 0.630 171.752

4

4h 6g 8g

0 175.000 0.300 174.700 172.402 0.160 172.242 169.778 0.060 174.940 0.475 174.465 172.342 0.250 172.092 169.628 0.060 174.940 0.750 174.190 172.342 0.400 171.942 169.478

5H 6H 7H

0 0 0

175.000 175.000 175.000

172.667 0.265 172.402 171.145 0.475 170.670 172.737 0.335 172.402 171.270 0.600 170.670 172.827 0.425 172.402 171.420 0.750 170.670

6

4h 6g 8g

0 175.000 0.375 174.625 171.103 0.190 170.913 167.217 0.080 174.920 0.600 174.320 171.023 0.300 170.723 167.027 0.080 174.920 0.950 173.970 171.023 0.475 170.548 166.852

5H 6H 7H

0 0 0

175.000 175.000 175.000

171.418 0.315 171.103 169.135 0.630 168.505 171.503 0.400 171.103 169.305 0.800 168.505 171.603 0.500 171.103 169.505 1.000 168.505

BS 3643-2:1981

30



2

3

4

5

6

Pitch

7

8

180

185

190

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

3

4h 6g 8g

0 180.000 0.236 179.764 178.051 0.140 177.911 176.063 0.048 179.952 0.375 179.577 178.003 0.224 177.779 175.931 0.048 179.952 0.600 179.352 178.003 0.355 177.648 175.800

5H 6H 7H

0 0 0

180.000 180.000 180.000

178.287 0.236 178.051 177.152 0.400 176.752 178.351 0.300 178.051 177.252 0.500 176.752 178.426 0.375 178.051 177.382 0.630 176.752

4

4h 6g 8g

0 180.000 0.300 179.700 177.402 0.160 177.242 174.778 0.060 179.940 0.475 179.475 177.342 0.250 177.092 174.628 0.060 179.940 0.750 179.190 177.342 0.400 176.942 174.478

5H 6H 7H

0 0 0

180.000 180.000 180.000

177.667 0.265 177.402 176.145 0.475 175.670 177.737 0.335 177.402 176.270 0.600 175.670 177.827 0.425 177.402 176.420 0.750 175.670

6

4h 6g 8g

0 180.000 0.375 179.625 176.103 0.190 175.913 172.217 0.080 179.920 0.600 179.320 176.023 0.300 175.723 172.027 0.080 179.920 0.950 178.970 176.023 0.475 175.548 171.852

5H 6H 7H

0 0 0

180.000 180.000 180.000

176.418 0.315 176.103 174.135 0.630 173.505 176.503 0.400 176.103 174.305 0.800 173.505 176.603 0.500 176.103 174.505 1.000 173.505

3

4h 6g 8g

0 185.000 0.236 184.764 183.051 0.160 182.891 181.043 0.048 184.952 0.375 184.577 183.003 0.250 182.753 180.905 0.048 184.952 0.600 184.352 183.003 0.400 182.603 180.755

5H 6H 7H

0 0 0

185.000 185.000 185.000

183.316 0.265 183.051 182.152 0.400 181.752 183.386 0.335 183.051 182.252 0.500 181.752 183.476 0.425 183.051 182.382 0.630 181.752

4

4h 6g 8g

0 185.000 0.300 184.700 182.402 0.180 182.222 179.758 0.060 184.940 0.475 184.465 182.342 0.280 182.062 179.598 0.060 184.940 0.750 184.190 182.342 0.450 181.892 179.428

5H 6H 7H

0 0 0

185.000 185.000 185.000

182.702 0.300 182.402 181.145 0.475 180.670 182.777 0.375 182.402 181.270 0.600 180.670 182.877 0.475 182.402 181.420 0.750 180.670

6

4h 6g 8g

0 185.000 0.375 184.625 181.103 0.200 180.903 177.207 0.080 184.920 0.600 184.320 181.023 0.315 180.708 177.012 0.080 184.920 0.950 183.970 181.023 0.500 180.523 176.827

5H 6H 7H

0 0 0

185.000 185.000 185.000

181.438 0.335 181.103 179.135 0.630 178.505 181.528 0.425 181.103 179.305 0.800 178.505 181.633 0.530 181.103 179.505 1.000 178.505

3

4h 6g 8g

0 190.000 0.236 189.764 188.051 0.160 187.891 186.043 0.048 189.952 0.375 189.577 188.003 0.250 187.753 185.905 0.048 189.952 0.600 189.352 188.003 0.400 187.603 185.755

5H 6H 7H

0 0 0

190.000 190.000 190.000

188.316 0.265 188.051 187.152 0.400 186.752 188.386 0.335 188.051 187.252 0.500 186.752 188.476 0.425 188.051 187.382 0.630 186.752

4

4h 6g 8g

0 190.000 0.300 189.700 187.402 0.180 187.222 184.758 0.060 189.940 0.475 189.465 187.342 0.280 187.062 184.598 0.060 189.940 0.750 189.190 187.342 0.450 186.892 184.428

5H 6H 7H

0 0 0

190.000 190.000 190.000

187.702 0.300 187.402 186.145 0.475 185.670 187.777 0.375 187.402 186.270 0.600 185.670 187.877 0.475 187.402 186.420 0.750 185.670

6

4h 6g 8g

0 190.000 0.375 189.625 186.103 0.200 185.903 182.207 0.080 189.920 0.600 189.320 186.023 0.315 185.708 182.012 0.080 189.920 0.950 189.970 186.023 0.500 185.523 181.827

5H 6H 7H

0 0 0

190.000 190.000 190.000

186.438 0.335 186.103 184.135 0.630 183.505 186.528 0.425 186.103 184.305 0.800 183.505 186.633 0.530 186.103 184.505 1.000 183.505

BS 3643-2:1981

31


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

195

200

205

9

10

11

12

13

14

15



Major diameter max.

© BSI 12-1998



tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

3

4h 6g 8g

0 195.000 0.236 194.764 193.051 0.160 192.891 191.043 0.048 194.952 0.375 194.577 193.003 0.250 192.753 190.905 0.048 194.952 0.600 194.352 193.003 0.400 192.603 190.755

5H 6H 7H

0 0 0

195.000 195.000 195.000

193.316 0.265 193.051 192.152 0.400 191.752 193.386 0.335 193.051 192.252 0.500 191.752 193.476 0.425 193.051 192.382 0.630 191.752

4

4h 6g 8g

0 195.000 0.300 194.700 192.402 0.180 192.222 189.758 0.060 194.940 0.475 194.465 192.342 0.280 192.062 189.598 0.060 194.940 0.750 194.190 192.342 0.450 191.892 189.428

5H 6H 7H

0 0 0

195.000 195.000 195.000

192.702 0.300 192.402 191.145 0.475 190.670 192.777 0.375 192.402 191.270 0.600 190.670 192.877 0.475 192.402 191.420 0.750 190.670

6

4h 6g 8g

0 195.000 0.375 194.625 191.103 0.200 190.903 187.207 0.080 194.920 0.600 194.320 191.023 0.315 190.708 187.012 0.080 194.920 0.950 193.970 191.023 0.500 190.523 186.827

5H 6H 7H

0 0 0

195.000 195.000 195.000

191.438 0.335 191.103 189.135 0.630 188.505 191.528 0.425 191.103 189.305 0.800 188.505 191.633 0.530 191.103 189.505 1.000 188.505

3

4h 6g 8g

0 200.000 0.236 199.764 198.051 0.160 197.891 196.043 0.048 199.952 0.375 199.577 198.003 0.250 197.753 195.905 0.048 199.952 0.600 199.352 198.003 0.400 197.603 195.755

5H 6H 7H

0 0 0

200.000 200.000 200.000

198.316 0.265 198.051 197.152 0.400 196.752 198.386 0.335 198.051 197.252 0.500 196.752 198.476 0.425 198.051 197.382 0.630 196.752

4

4h 6g 8g

0 200.000 0.300 199.700 197.402 0.180 197.222 194.758 0.060 199.940 0.475 199.465 197.342 0.280 197.062 194.598 0.060 199.940 0.750 199.190 197.342 0.450 196.892 194.428

5H 6H 7H

0 0 0

200.000 200.000 200.000

197.702 0.300 197.402 196.145 0.475 195.670 197.777 0.375 197.402 196.270 0.600 195.670 197.877 0.475 197.402 196.420 0.750 195.670

6

4h 6g 8g

0 200.000 0.375 199.625 196.103 0.200 195.903 192.207 0.080 199.920 0.600 199.320 196.023 0.315 195.708 192.012 0.080 199.920 0.950 198.970 196.023 0.500 195.523 191.827

5H 6H 7H

0 0 0

200.000 200.000 200.000

196.438 0.335 196.103 194.135 0.630 193.505 196.528 0.425 196.103 194.305 0.800 193.505 196.633 0.530 196.103 194.505 1.000 193.505

3

4h 6g 8g

0 205.000 0.236 204.764 203.051 0.160 202.891 201.043 0.048 204.952 0.375 204.577 203.003 0.250 202.753 200.905 0.048 204.952 0.600 204.352 203.003 0.400 202.603 200.755

5H 6H 7H

0 0 0

205.000 205.000 205.000

203.316 0.265 203.051 202.152 0.400 201.752 203.386 0.335 203.051 202.252 0.500 201.752 203.476 0.425 203.051 202.382 0.630 201.752

4

4h 6g 8g

0 205.000 0.300 204.700 202.402 0.180 202.222 199.758 0.060 204.940 0.475 204.465 202.342 0.280 202.062 199.598 0.060 204.940 0.750 204.190 202.342 0.450 201.892 199.428

5H 6H 7H

0 0 0

205.000 205.000 205.000

202.702 0.300 202.402 201.145 0.475 200.670 202.777 0.375 202.402 201.270 0.600 200.670 202.877 0.475 202.402 201.420 0.750 200.670

6

4h 6g 8g

0 205.000 0.375 204.625 201.103 0.200 200.903 197.207 0.080 204.920 0.600 204.320 201.023 0.315 200.708 197.012 0.080 204.920 0.950 203.970 201.023 0.500 200.523 196.827

5H 6H 7H

0 0 0

205.000 205.000 205.000

201.438 0.335 201.103 199.135 0.630 198.505 201.528 0.425 201.103 199.305 0.800 198.505 201.633 0.530 201.103 199.505 1.000 198.505

BS 3643-2:1981

32



2

3

4

5

6

Pitch

7

8

210

215

220

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

3

4h 6g 8g

0 210.000 0.236 209.764 208.051 0.160 207.891 206.043 0.048 209.952 0.375 209.577 208.003 0.250 207.753 205.905 0.048 209.952 0.600 209.352 208.003 0.400 207.603 205.755

5H 6H 7H

0 0 0

210.000 210.000 210.000

208.316 0.265 208.051 207.152 0.400 206.752 208.386 0.335 208.051 207.252 0.500 206.752 208.476 0.425 208.051 207.382 0.630 206.752

4

4h 6g 8g

0 210.000 0.300 209.700 207.402 0.180 207.222 204.758 0.060 209.940 0.475 209.465 207.342 0.280 207.062 204.598 0.060 209.940 0.750 209.190 207.342 0.450 206.892 204.428

5H 6H 7H

0 0 0

210.000 210.000 210.000

207.702 0.300 207.402 206.145 0.475 205.670 207.777 0.375 207.402 206.270 0.600 205.670 207.877 0.475 207.402 206.420 0.750 205.670

6

4h 6g 8g

0 210.000 0.375 209.625 206.103 0.200 205.903 202.207 0.080 209.920 0.600 209.320 206.023 0.315 205.708 202.012 0.080 209.920 0.950 208.970 206.023 0.500 205.523 201.827

5H 6H 7H

0 0 0

210.000 210.000 210.000

206.438 0.335 206.103 204.135 0.630 203.505 206.528 0.425 206.103 204.305 0.800 203.505 206.633 0.530 206.103 204.505 1.000 203.505

3

4h 6g 8g

0 215.000 0.236 214.764 213.051 0.160 212.891 211.043 0.048 214.952 0.375 214.577 213.003 0.250 212.753 210.905 0.048 214.952 0.600 214.352 213.003 0.400 212.603 210.755

5H 6H 7H

0 0 0

215.000 215.000 215.000

213.316 0.265 213.051 212.152 0.400 211.752 213.386 0.335 213.051 212.252 0.500 211.752 213.476 0.425 213.051 212.382 0.630 211.752

4

4h 6g 8g

0 215.000 0.300 214.700 212.402 0.180 212.222 209.758 0.060 214.940 0.475 214.465 212.342 0.280 212.062 209.598 0.060 214.940 0.750 214.190 212.342 0.450 211.892 209.428

5H 6H 7H

0 0 0

215.000 215.000 215.000

212.702 0.300 212.402 211.145 0.475 210.670 212.777 0.375 212.402 211.270 0.600 210.670 212.877 0.475 212.402 211.420 0.750 210.670

6

4h 6g 8g

0 215.000 0.375 214.625 211.103 0.200 210.903 207.207 0.080 214.920 0.600 214.320 211.023 0.315 210.708 207.012 0.080 214.920 0.950 213.970 211.023 0.500 210.523 206.827

5H 6H 7H

0 0 0

215.000 215.000 215.000

211.438 0.335 211.103 209.135 0.630 208.505 211.528 0.425 211.103 209.305 0.800 208.505 211.633 0.530 211.103 209.505 1.000 208.505

3

4h 6g 8g

0 220.000 0.236 219.764 218.051 0.160 217.891 216.043 0.048 219.952 0.375 219.577 218.003 0.250 217.753 215.905 0.048 219.952 0.600 219.352 218.003 0.400 217.603 215.755

5H 6H 7H

0 0 0

220.000 220.000 220.000

218.316 0.265 218.051 217.152 0.400 216.752 218.386 0.335 218.051 217.252 0.500 216.752 218.476 0.425 218.051 217.382 0.630 216.752

4

4h 6g 8g

0 220.000 0.300 219.700 217.402 0.180 217.222 214.758 0.060 219.940 0.475 219.465 217.342 0.280 217.062 214.598 0.060 219.940 0.750 219.190 217.342 0.450 216.892 214.428

5H 6H 7H

0 0 0

220.000 220.000 220.000

217.702 0.300 217.402 216.145 0.475 215.670 217.777 0.375 217.402 216.270 0.600 215.670 217.877 0.475 217.402 216.420 0.750 215.670

6

4h 6g 8g

0 220.000 0.375 219.625 216.103 0.200 215.903 212.207 0.080 219.920 0.600 219.320 216.023 0.315 215.708 212.012 0.080 219.920 0.950 218.970 216.023 0.500 215.523 211.827

5H 6H 7H

0 0 0

220.000 220.000 220.000

216.438 0.335 216.103 214.135 0.630 213.505 216.528 0.425 216.103 214.305 0.800 213.505 216.633 0.530 216.103 214.505 1.000 213.505

BS 3643-2:1981

33


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

225

230

235

9

10

11

12

13

14

15



Major diameter max.

© BSI 12-1998



tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

3

4h 6g 8g

0 225.000 0.236 224.764 223.051 0.160 222.891 221.043 0.048 224.952 0.375 224.577 223.003 0.250 222.753 220.905 0.048 224.952 0.600 224.352 223.003 0.400 222.603 220.755

5H 6H 7H

0 0 0

225.000 225.000 225.000

223.316 0.265 223.051 222.152 0.400 221.752 223.386 0.335 223.051 222.252 0.500 221.752 223.476 0.425 223.051 222.382 0.630 221.752

4

4h 6g 8g

0 225.000 0.300 224.700 222.402 0.180 222.222 219.758 0.060 224.940 0.475 224.465 222.342 0.280 222.062 219.598 0.060 224.940 0.750 224.190 222.342 0.450 221.892 219.428

5H 6H 7H

0 0 0

225.000 225.000 225.000

222.702 0.300 222.402 221.145 0.475 220.670 222.777 0.375 222.402 221.270 0.600 220.670 222.877 0.475 222.402 221.420 0.750 220.670

6

4h 6g 8g

0 225.000 0.375 224.625 224.103 0.200 220.903 217.207 0.080 224.920 0.600 224.320 224.023 0.315 220.708 217.012 0.080 224.920 0.950 223.970 223.023 0.500 220.523 216.827

5H 6H 7H

0 0 0

225.000 225.000 225.000

221.438 0.335 221.103 219.135 0.630 218.505 221.528 0.425 221.103 219.305 0.800 218.505 221.633 0.530 221.103 219.505 1.000 218.505

3

4h 6g 8g

0 230.000 0.236 229.764 228.051 0.160 227.891 226.043 0.048 229.952 0.375 229.577 228.003 0.250 227.753 225.905 0.048 229.952 0.600 229.352 228.003 0.400 227.603 225.755

5H 6H 7H

0 0 0

230.000 230.000 230.000

228.316 0.265 228.051 227.152 0.400 226.752 228.386 0.335 228.051 227.252 0.500 226.752 228.476 0.425 228.051 227.382 0.630 226.752

4

4h 6g 8g

0 230.000 0.300 229.700 227.402 0.180 227.222 224.758 0.060 229.940 0.475 229.465 227.342 0.280 227.062 224.598 0.060 229.940 0.750 229.190 227.342 0.450 226.892 224.428

5H 6H 7H

0 0 0

230.000 230.000 230.000

227.702 0.300 227.402 226.145 0.475 225.670 227.777 0.375 227.402 226.270 0.600 225.670 227.877 0.475 227.402 226.420 0.750 225.670

6

4h 6g 8g

0 230.000 0.375 229.625 226.103 0.200 225.903 222.207 0.080 229.920 0.600 229.320 226.023 0.315 225.708 222.012 0.080 229.920 0.950 228.970 226.023 0.500 225.523 221.827

5H 6H 7H

0 0 0

230.000 230.000 230.000

226.438 0.335 226.103 224.135 0.630 223.505 226.528 0.425 226.103 224.305 0.800 223.505 226.633 0.530 226.103 224.505 1.000 223.505

3

4h 6g 8g

0 235.000 0.236 234.764 233.051 0.160 232.891 231.043 0.048 234.952 0.375 234.577 233.003 0.250 232.753 230.905 0.048 234.952 0.600 234.352 233.003 0.400 232.603 230.755

5H 6H 7H

0 0 0

235.000 235.000 235.000

233.316 0.265 233.051 232.152 0.400 231.752 233.386 0.335 233.051 232.252 0.500 231.752 233.476 0.425 233.051 232.382 0.630 231.752

4

4h 6g 8g

0 235.000 0.300 234.700 232.402 0.180 232.222 229.758 0.060 234.940 0.475 234.465 232.342 0.280 232.062 229.598 0.060 234.940 0.750 234.190 232.342 0.450 231.892 229.428

5H 6H 7H

0 0 0

235.000 235.000 235.000

232.702 0.300 232.402 231.145 0.475 230.670 232.777 0.375 232.402 231.270 0.600 230.670 232.877 0.475 232.402 231.420 0.750 230.670

6

4h 6g 8g

0 235.000 0.375 234.625 231.103 0.200 230.903 227.207 0.080 234.920 0.600 234.320 231.023 0.315 230.708 227.012 0.080 234.920 0.950 233.970 231.023 0.500 230.523 226.827

5H 6H 7H

0 0 0

235.000 235.000 235.000

231.438 0.335 231.103 229.135 0.630 228.505 231.528 0.425 231.103 229.305 0.800 228.505 231.633 0.530 231.103 229.505 1.000 228.505

BS 3643-2:1981

34



2

3

4

5

6

Pitch

7

8

240

245

250

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

3

4h 6g 8g

0 240.000 0.236 239.764 238.051 0.160 237.891 236.043 0.048 239.952 0.375 239.577 238.003 0.250 237.753 235.905 0.048 239.952 0.600 239.352 238.003 0.400 237.603 235.755

5H 6H 7H

0 0 0

240.000 240.000 240.000

238.316 0.265 238.051 237.152 0.400 236.752 238.386 0.335 238.051 237.252 0.500 236.752 238.476 0.425 238.051 237.382 0.630 236.752

4

4h 6g 8g

0 240.000 0.300 239.700 237.402 0.180 237.222 234.758 0.060 239.940 0.475 239.465 237.342 0.280 237.062 234.598 0.060 239.940 0.750 239.190 237.342 0.450 236.892 234.428

5H 6H 7H

0 0 0

240.000 240.000 240.000

237.702 0.300 237.402 236.145 0.475 235.670 237.777 0.375 237.402 236.270 0.600 235.670 237.877 0.475 237.402 236.420 0.750 235.670

6

4h 6g 8g

0 240.000 0.375 239.625 236.103 0.200 235.903 232.207 0.080 239.920 0.600 239.320 236.023 0.315 235.708 232.012 0.080 239.920 0.950 238.970 236.023 0.500 235.523 231.827

5H 6H 7H

0 0 0

240.000 240.000 240.000

236.438 0.335 236.103 234.135 0.630 233.505 236.528 0.425 236.103 234.305 0.800 233.505 236.633 0.530 236.103 234.505 1.000 233.505

3

4h 6g 8g

0 245.000 0.236 244.764 243.051 0.160 242.891 241.043 0.048 244.952 0.375 244.577 243.003 0.250 242.753 240.905 0.048 244.952 0.600 244.352 243.003 0.400 242.603 240.755

5H 6H 7H

0 0 0

245.000 245.000 245.000

243.316 0.265 243.051 242.152 0.400 241.752 243.386 0.335 243.051 242.252 0.500 241.752 243.476 0.425 243.051 242.382 0.630 241.752

4

4h 6g 8g

0 245.000 0.300 244.700 242.402 0.180 242.222 239.758 0.060 244.940 0.475 244.465 242.342 0.280 242.062 239.598 0.060 244.940 0.750 244.190 242.342 0.450 241.892 239.428

5H 6H 7H

0 0 0

245.000 245.000 245.000

242.702 0.300 242.402 241.145 0.475 240.670 242.777 0.375 242.402 241.270 0.600 240.670 242.877 0.475 242.402 241.420 0.750 240.670

6

4h 6g 8g

0 245.000 0.375 244.625 241.103 0.200 240.903 237.207 0.080 244.920 0.600 244.320 241.023 0.315 240.708 237.012 0.080 244.920 0.950 243.970 241.023 0.500 240.523 236.827

5H 6H 7H

0 0 0

245.000 245.000 245.000

241.438 0.335 241.103 239.135 0.630 238.505 241.528 0.425 241.103 239.305 0.800 238.505 241.633 0.530 241.103 239.505 1.000 238.505

3

4h 6g 8g

0 250.000 0.236 249.764 248.051 0.160 247.891 246.043 0.048 249.952 0.375 249.577 248.003 0.250 247.753 245.905 0.048 249.952 0.600 249.352 248.003 0.400 247.603 245.755

5H 6H 7H

0 0 0

250.000 250.000 250.000

248.316 0.265 248.051 247.152 0.400 246.752 248.386 0.335 248.051 247.252 0.500 246.752 248.476 0.425 248.051 247.382 0.630 246.752

4

4h 6g 8g

0 250.000 0.300 249.700 247.402 0.180 247.222 244.758 0.060 249.940 0.475 249.465 247.342 0.280 247.062 244.598 0.060 249.940 0.750 249.190 247.342 0.450 247.892 244.428

5H 6H 7H

0 0 0

250.000 250.000 250.000

247.702 0.300 247.402 246.145 0.475 245.670 247.777 0.375 247.402 246.270 0.600 245.670 247.877 0.475 247.402 246.420 0.750 245.670

6

4h 6g 8g

0 250.000 0.375 249.625 246.103 0.200 245.903 242.207 0.080 249.920 0.600 249.320 246.023 0.315 245.708 242.012 0.080 249.920 0.950 248.970 246.023 0.500 245.523 241.827

5H 6H 7H

0 0 0

250.000 250.000 250.000

246.438 0.335 246.103 244.135 0.630 243.505 246.528 0.425 246.103 244.305 0.800 243.505 246.633 0.530 246.103 244.505 1.000 243.505

BS 3643-2:1981

35


© BSI 12-1998


1 Nominal diameter

2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4

4h 6g 8g

0 255.000 0.300 254.700 252.402 0.180 252.222 249.758 0.060 254.940 0.475 254.465 252.342 0.280 252.062 249.598 0.060 254.940 0.750 254.190 252.342 0.450 251.892 249.428

5H 6H 7H

0 0 0

255.000 255.000 255.000

252.702 0.300 252.402 251.145 0.475 250.670 252.777 0.375 252.402 251.270 0.600 250.670 252.877 0.475 252.402 251.420 0.750 250.670

6

4h 6g 8g

0 255.000 0.375 254.625 251.103 0.200 250.903 247.207 0.080 254.920 0.600 254.320 251.023 0.315 250.708 247.012 0.080 254.920 0.950 253.970 251.023 0.500 250.523 246.827

5H 6H 7H

0 0 0

255.000 255.000 255.000

251.438 0.335 251.103 249.135 0.630 248.505 251.528 0.425 251.103 249.305 0.800 248.505 251.633 0.530 251.103 249.505 1.000 248.505

4

4h 6g 8g

0 260.000 0.300 259.700 257.402 0.180 257.222 254.758 0.060 259.940 0.475 259.465 257.342 0.280 257.062 254.598 0.060 259.940 0.750 259.190 257.342 0.450 256.892 254.428

5H 6H 7H

0 0 0

260.000 260.000 260.000

257.702 0.300 257.402 256.145 0.475 255.670 257.777 0.375 257.402 256.270 0.600 255.670 257.877 0.475 257.402 256.420 0.750 255.670

6

4h 6g 8g

0 260.000 0.375 259.625 256.103 0.200 255.903 252.207 0.080 259.920 0.600 259.320 256.023 0.315 255.708 252.012 0.080 259.920 0.950 258.970 256.023 0.500 255.523 251.827

5H 6H 7H

0 0 0

260.000 260.000 260.000

256.438 0.335 256.103 254.135 0.630 253.505 256.528 0.425 256.103 254.305 0.800 253.505 256.633 0.530 256.103 254.505 1.000 253.505

4

4h 6g 8g

0 265.000 0.300 264.700 262.402 0.180 262.222 259.758 0.060 264.940 0.475 264.465 262.342 0.280 262.062 259.598 0.060 264.940 0.750 264.190 262.342 0.450 261.892 259.428

5H 6H 7H

0 0 0

265.000 265.000 265.000

262.702 0.300 262.402 261.145 0.475 260.670 262.777 0.375 262.402 261.270 0.600 260.670 262.877 0.475 262.402 261.420 0.750 260.670

6

4h 6g 8g

0 265.000 0.375 264.625 261.103 0.200 260.903 257.207 0.080 264.920 0.600 264.320 261.023 0.315 260.708 257.012 0.080 264.920 0.950 263.970 261.023 0.500 260.523 256.827

5H 6H 7H

0 0 0

265.000 265.000 265.000

261.438 0.335 261.103 259.135 0.630 258.505 261.528 0.425 261.103 259.305 0.800 258.505 261.633 0.530 261.103 259.505 1.000 258.505

4

4h 6g 8g

0 270.000 0.300 269.700 267.402 0.180 267.222 264.758 0.060 269.940 0.475 269.465 267.342 0.280 267.062 264.598 0.060 269.940 0.750 269.190 267.342 0.450 266.892 264.428

5H 6H 7H

0 0 0

270.000 270.000 270.000

267.702 0.300 267.402 266.145 0.475 265.670 267.777 0.375 267.402 266.270 0.600 265.670 267.877 0.475 267.402 266.420 0.750 265.670

6

4h 6g 8g

0 270.000 0.375 269.625 266.103 0.200 265.903 262.207 0.080 269.920 0.600 269.320 266.023 0.315 265.708 262.012 0.080 269.920 0.950 268.970 266.023 0.500 265.523 261.827

5H 6H 7H

0 0 0

270.000 270.000 270.000

266.438 0.335 266.103 264.135 0.630 263.505 266.528 0.425 266.103 264.305 0.800 263.505 266.633 0.530 266.103 264.505 1.000 263.505

4

4h 6g 8g

0 275.000 0.300 274.700 272.402 0.180 272.222 269.758 0.060 274.940 0.475 274.465 272.342 0.280 272.062 269.598 0.060 274.940 0.750 274.190 272.342 0.450 271.892 269.428

5H 6H 7H

0 0 0

275.000 275.000 275.000

272.702 0.300 272.402 271.145 0.475 270.670 272.777 0.375 272.402 271.270 0.600 270.670 272.877 0.475 272.402 271.420 0.750 270.670

6

4h 6g 8g

0 275.000 0.375 274.625 271.103 0.200 270.903 267.207 0.080 274.920 0.600 274.320 271.023 0.315 270.708 267.012 0.080 274.920 0.950 273.970 271.023 0.500 270.523 266.827

5H 6H 7H

0 0 0

275.000 275.000 275.000

271.438 0.335 271.103 269.135 0.630 268.505 271.528 0.425 271.103 269.305 0.800 268.505 271.633 0.530 271.103 269.505 1.000 268.505

255

260

265

270

275

© BSI 12-1998



BS 3643-2:1981

36



2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15



Major diameter max.

tol.

min.

17

18

19

20

21

22


Pitch diameter max.

16

tol.

min.


min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

4h 6g 8g

0 280.000 0.300 279.700 277.402 0.180 277.222 274.758 0.060 279.940 0.475 279.465 277.342 0.280 277.062 274.598 0.060 279.940 0.750 279.190 277.342 0.450 276.892 274.428

5H 6H 7H

0 0 0

280.000 280.000 280.000

277.702 0.300 277.402 276.145 0.475 275.670 277.777 0.375 277.402 276.270 0.600 275.670 277.877 0.475 277.402 276.420 0.750 275.670

6

4h 6g 8g

0 280.000 0.375 279.625 276.103 0.200 275.903 272.207 0.080 279.920 0.600 279.320 276.023 0.315 275.708 272.012 0.080 279.920 0.950 278.970 276.023 0.500 275.523 271.827

5H 6H 7H

0 0 0

280.000 280.000 280.000

276.438 0.335 276.103 274.135 0.630 273.505 276.528 0.425 276.103 274.305 0.800 273.505 276.633 0.530 276.103 274.505 1.000 273.505

4

4h 6g 8g

0 285.000 0.300 284.700 282.402 0.180 282.222 279.758 0.060 284.940 0.475 284.465 282.342 0.280 282.062 279.598 0.060 284.940 0.750 284.190 282.342 0.450 281.892 279.428

5H 6H 7H

0 0 0

285.000 285.000 285.000

282.702 0.300 282.402 281.145 0.475 280.670 282.777 0.375 282.402 281.270 0.600 280.670 282.877 0.475 282.402 281.420 0.750 280.670

6

4h 6g 8g

0 285.000 0.375 284.625 281.103 0.200 280.903 277.207 0.080 284.920 0.600 284.320 281.023 0.315 280.708 277.012 0.080 284.920 0.950 283.970 281.023 0.500 280.523 276.827

5H 6H 7H

0 0 0

285.000 285.000 285.000

281.438 0.335 281.103 279.135 0.630 278.505 281.528 0.425 281.103 279.305 0.800 278.505 281.633 0.530 281.103 279.505 1.000 278.505

4

4h 6g 8g

0 290.000 0.300 289.700 287.402 0.180 287.222 284.758 0.060 289.940 0.475 289.465 287.342 0.280 287.062 284.598 0.060 289.940 0.750 289.190 287.342 0.450 286.892 284.428

5H 6H 7H

0 0 0

290.000 290.000 290.000

287.702 0.300 287.402 286.145 0.475 285.670 287.777 0.375 287.402 286.270 0.600 285.670 287.877 0.475 287.402 286.420 0.750 285.670

6

4h 6g 8g

0 290.000 0.375 289.625 286.103 0.200 285.903 282.207 0.080 289.920 0.600 289.320 286.023 0.315 285.708 282.012 0.080 289.920 0.950 288.970 286.023 0.500 285.523 281.827

5H 6H 7H

0 0 0

290.000 290.000 290.000

286.438 0.335 286.103 284.135 0.630 283.505 286.528 0.425 286.103 284.305 0.800 283.505 286.633 0.530 286.103 284.505 1.000 283.505

4

4h 6g 8g

0 295.000 0.300 294.700 292.402 0.180 292.222 289.758 0.060 294.940 0.475 294.465 292.342 0.280 292.062 289.598 0.060 294.940 0.750 294.190 292.342 0.450 291.892 289.428

5H 6H 7H

0 0 0

295.000 295.000 295.000

292.702 0.300 292.402 291.145 0.475 290.670 292.777 0.375 292.402 291.270 0.600 290.670 292.877 0.475 292.402 291.420 0.750 290.670

6

4h 6g 8g

0 295.000 0.375 294.625 291.103 0.200 290.903 287.207 0.080 294.920 0.600 294.320 291.023 0.315 290.708 287.012 0.080 294.920 0.950 263.970 291.023 0.500 290.523 286.827

5H 6H 7H

0 0 0

295.000 295.000 295.000

291.438 0.335 291.103 289.135 0.630 288.505 291.528 0.425 291.103 289.305 0.800 288.505 291.633 0.530 291.103 289.505 1.000 288.505

4

4h 6g 8g

0 300.000 0.300 299.700 297.402 0.180 297.222 294.758 0.060 299.940 0.475 299.465 297.342 0.280 297.062 294.598 0.060 299.940 0.750 299.190 297.342 0.450 296.892 294.428

5H 6H 7H

0 0 0

300.000 300.000 300.000

297.702 0.300 297.402 296.145 0.475 295.670 297.777 0.375 297.402 296.270 0.600 295.670 297.877 0.475 297.402 296.420 0.750 295.670

6

4h 6g 8g

0 300.000 0.375 299.625 296.103 0.200 295.903 292.207 0.080 299.920 0.600 299.320 296.023 0.315 295.708 292.012 0.080 299.920 0.950 298.970 296.023 0.500 295.523 291.827

5H 6H 7H

0 0 0

300.000 300.000 300.000

296.438 0.335 296.103 294.135 0.630 293.505 296.528 0.425 296.103 294.305 0.800 293.505 296.633 0.530 296.103 294.505 1.000 293.505

285

290

295

300

BS 3643-2:1981

4 280

37


© BSI 12-1998


© BSI 12-1998


The diameter/pitch combinations for tolerance classes 4H, 6h and 4g given in Table 2 are primarily for aerospace use.

BS 3643-2:1981

38

Appendix A Additional tolerance classes for aerospace use

NOTE For the minor diameter of external threads this table specifies the minimum dimensions only. The maximum dimensions have not been specified based on the requirements of 6.10 of BS 3643-1:1981 that these dimensions are controlled by the Go gauge. All dimensions are in millimetres. 1 Nominal diameter

2

3

4

5

6

Pitch

7

8

9

10

11

12

13

14

15

16



Major diameter max.

tol.

17

18

19

20

21

22


Pitch diameter tol.

min.

Minor Tolerance Fund Major diameter class dev. diameter

min.

max.

min.

1.600 0.085 1.581 0.053

1.515 1.528

1.373 0.063 1.354 0.040

1.310 1.094 1.314 1.098

4H

Pitch diameter

min.

max.

tol.

Minor diameter

min.

max.

tol.

min.

1.6

0.35

6h 4g

2

0.4

6h 4g

0 0.019

2.000 0.095 1.981 0.060

1.905 1.921

1.740 0.067 1.721 0.042

1.673 1.427 1.679 1.433

4H

2.5

0.45

6h 4g

0 0.020

2.500 0.100 2.480 0.063

2.400 2.417

2.208 0.071 2.188 0.045

2.137 1.859 2.143 1.865

4H

3

0.5

6h 4g

0 0.020

3.000 0.106 2.980 0.067

2.894 2.913

2.675 0.075 2.655 0.048

2.600 2.292 2.607 2.299

4H

0

3.000

2.738 0.063

2.675

2.549 0.090

2.459

4

0.7

6h 4g

0 0.022

4.000 0.140 3.978 0.090

3.860 3.888

3.545 0.090 3.523 0.056

3.455 3.024 3.467 3.036

4H

0

4.000

3.620 0.075

3.545

3.354 0.112

3.242

5

0.8

6h 4g

0 0.024

5.000 0.150 4.976 0.095

4.850 4.881

4.480 0.095 4.456 0.060

4.385 3.892 4.396 3.903

4H

0

5.000

4.560 0.080

4.480

4.259 0.125

4.134

6

1

6h 4g

0 0.026

6.000 0.180 5.974 0.112

5.820 5.863

5.350 0.112 5.324 0.071

5.238 4.622 5.253 4.637

4H

0

6.000

5.445 0.095

5.350

5.067 0.150

4.917

8

1.25

6h 4g

0 0.028

8.000 0.212 7.972 0.132

7.788 7.840

7.188 0.118 7.160 0.075

7.070 6.300 7.085 6.315

4H

0

8.000

7.288 0.100

7.188

6.817 0.170

6.647

10

1.5

6h 4g

0 10.000 0.236 0.032 9.968 0.150

9.764 9.818

9.026 0.132 8.994 0.085

8.894 7.970 8.909 7.985

4H

0

10.00

9.138 0.112

9.026

8.566 0.190

8.376

6h 4g

0 12.000 0.236 11.764 11.026 0.140 10.886 9.962 0.032 11.968 0.150 11.818 10.994 0.090 10.904 9.980

4H

0

12.000

1.5

0 0.019

          

See Table 1

11.144 0.118 11.026 10.566 0.190 10.376

BS 3643-2:1981

12

39


© BSI 12-1998

Table 2 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement for aerospace use

1 Nominal diameter

2

3

4

5

6

Pitch

7

8

9

10

11

12

13



Major diameter max.

© BSI 12-1998



tol.

min.

15

16

17

18

19

20

21

22


Pitch diameter max.

14

tol.

min.


14

1.5

6h 4g

0 14.000 0.236 13.764 13.026 0.140 12.886 11.962 0.032 13.968 0.150 13.818 12.994 0.090 12.904 11.980

16

1.5

6h 4g

0 16.000 0.236 15.764 15.026 0.140 14.886 13.962 0.032 15.968 0.150 15.818 14.994 0.090 14.904 13.980

18

1.5

6h 4g

0 18.000 0.236 17.764 17.026 0.140 16.886 15.962 0.032 17.968 0.150 17.818 16.994 0.090 16.904 15.980

20

1.5

6h 4g

0 20.000 0.236 19.764 19.026 0.140 18.886 17.962 0.032 19.968 0.150 19.818 18.994 0.090 18.904 17.980

22

1.5

6h 4g

0 22.000 0.236 21.764 21.026 0.140 20.886 19.962 0.032 21.968 0.150 21.818 20.994 0.090 20.904 19.980

24

2

6h 4g

0 24.000 0.280 23.720 22.701 0.170 22.531 21.299 0.038 23.962 0.180 23.782 22.663 0.106 22.557 21.325

27

2

6h 4g

0 27.000 0.280 26.720 25.701 0.170 25.531 24.299 0.038 26.962 0.180 26.782 25.663 0.106 25.557 24.325

30

2

6h 4g

0 30.000 0.280 29.720 28.701 0.170 28.531 27.299 0.038 29.962 0.180 29.782 28.663 0.106 28.557 27.325

33

2

6h 4g

0 33.000 0.280 32.720 31.701 0.170 31.531 30.299 0.038 32.962 0.180 32.782 31.663 0.106 31.557 30.325

36

2

6h 4g

0 36.000 0.280 35.720 34.701 0.170 34.531 33.299 0.038 35.962 0.180 35.782 34.663 0.106 34.557 33.325

39

2

6h 4g

0 36.000 0.280 38.720 37.701 0.170 37.531 36.299 0.038 38.962 0.180 38.782 37.663 0.106 37.557 36.325

min.

Pitch diameter max.

tol.

min.

Minor diameter max.

tol.

min.

BS 3643-2:1981

40

Table 2 — ISO metric screw threads: limits and tolerances for finished uncoated threads for normal length of engagement for aerospace use

BS 3643-2:1981

Publications referred to


BS 3382, Electroplated coatings on threaded components1). BS 3643, ISO metric screw threads. BS 3643-1, Principles and basic data1). PD 6494, Mismatch of screw thread systems. ISO/DIS 4042, Electroplated coatings on threaded components1).

1) Referred

to in the foreword only.

© BSI 12-1998


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