BS-919-1-2007.pdf
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1、BS 919-1:2007 Screw gauge limits and tolerances Part 1: Specification for gauges for screw threads of unified form ICS 21.040.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Licensed Copy: London South Bank University, London South Bank University, Fri Nov
2、16 07:27:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007 ISBN 978 0 580 57933 2 The following BSI references relate to the work on this standard: Committee ref
3、erence TDW/4 Draft for comment 07/30158512 DC Publication history First published April 1952 Second edition, December 1960 Third edition, November 2007 Amendments issued since publication Amd. no.DateText affected BS 919-1:2007 Licensed Copy: London South Bank University, London South Bank Universit
4、y, Fri Nov 16 07:27:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007i BS 919-1:2007 Contents Foreword iii 1Scope 1 2Normative references 1 3Terms and definitions and symbols 1 4Design 2 5Tolerances and thread forms 3 6Marking 25 Annexes Annex A (informative) Verifying conformity with BS 1580 2
5、6 Annex B (informative) Conventional illustration of tolerance zones 34 Annex C (informative) Effective diameter equivalent of pitch and angle errors 34 Annex D (informative) A system of gauging for screw threads before and after coating 37 Annex E (informative) Setting to size of adjustable screw r
6、ing gauges 40 Annex F (informative) Comparison between the designations of British and American gauges 42 Annex G (informative) Tolerances for major, effective and minor diameters and flank angle and pitch 43 Annex H (informative) Hardness 44 Bibliography 45 List of figures Figure 1 Disposition of e
7、ffective diameter tolerance zones for screw gauges 18 Figure 2 Thread forms of GO gauges 20 Figure 3 Thread forms of NOT GO gauges 21 Figure 4 Forms of thread for NOT GO effective diameter screw gauges 22 Figure 5 Thread forms of setting plugs 24 Figure B.1 Limits and tolerances for the effective di
8、ameters of internal and external threads 34 List of tables Table 1 Tolerances for GO screw plug gauges all classes 5 Table 2 Tolerances for NOT GO screw plug gauges all classes 6 Table 3 Tolerances for GO and NOT GO plain plug gauges for minor diameters 7 Table 4 Tolerances for GO screw ring gauges
9、solid type, all classes 7 Table 5 Tolerances for NOT GO effective diameter screw ring gauges solid type, all classes 8 Table 6 Tolerances for GO screw check plugs for GO screw ring gauges solid type 8 Table 7 Tolerances for NOT GO effective diameter check plugs for new GO screw ring gauges solid typ
10、e 9 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:27:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS 919-1:2007 ii BSI 2007 Table 8 Tolerances for NOT GO effective diameter check plugs for worn GO ring screw gauges solid type 9 Table 9 Tolerances for GO sc
11、rew check plugs for NOT GO effective diameter ring gauges solid type 10 Table 10 Tolerances for NOT GO screw check plugs for NOT GO effective diameter ring gauges solid type 10 Table 11 Tolerances for GO and NOT GO plain check plugs for the minor diameters of GO and NOT GO screw ring gauges solid ty
12、pe 10 Table 12 Tolerances for adjustable GO screw ring and calliper gauges for all classes 11 Table 13 Tolerances for adjustable NOT GO screw ring and calliper gauges for all classes 12 Table 14 Tolerances for double length setting plugs for adjustable GO screw ring gauges 13 Table 15 Tolerances for
13、 double length setting plugs for adjustable NOT GO screw ring gauges 14 Table 16 Tolerances for single length setting plugs for adjustable GO screw calliper gauges 15 Table 17 Tolerances for single length setting plugs for adjustable NOT GO screw calliper gauges 15 Table 18 Tolerances for GO and NOT
14、 GO plain calliper (GAP) gauges for major diameters 16 Table 19 Constants for use in calculating gauge dimensions (inch) 17 Table C.1 Effective diameter equivalents of errors in pitch 35 Table C.2 Effective diameter equivalents of errors in flank angles 36 Table D.1 External threads with specified a
15、llowances which have to be maintained after coating Unified threads, Class 1A 38 Table D.2 External screw threads with specified allowances (in the uncoated condition) which can be absorbed by the coating Unified threads, Class 2A 38 Table D.3 External screw threads with no specified allowance Unifi
16、ed threads, Class 3A 39 Table D.4 Unified threads, Classes 1B and 2B 39 Table D.5 Unified threads, Class 3B 39 Table D.6 Summary of GO and NOT GO screw gauges and plain gauges for checking unified threads 40 Summary of pages This document comprises a front cover, an inside front cover, pages i to iv
17、, pages 1 to 45 and a back cover. Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:27:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 2007iii BS 919-1:2007 Foreword Publishing information This British Standard is published by BSI and came into effect on 30 N
18、ovember 2007. It was prepared by Subcommittee SFTSE/1, Screws and fasteners technical specification committee, under the authority of Technical Committee TDW/4, Technical product realization. A list of organizations represented on these committees can be obtained on request to their secretaries. BS
19、919, Screw gauge limits and tolerances is in four parts: Part 1: Specification for gauges for screw threads of unified form Part 2: Specification for gauges for screw threads of Whitworth and B.A. forms Part 3: Specification for gauges for screw threads of ISO metric form Part 4: Limits of size for
20、gauges for screw threads of unified form diameters in and larger Supersession This Part of BS 919 supersedes BS 919-1:1960, which is withdrawn. Relationship with other publications This British Standard is intended for use with BS 1580, which specifies the corresponding screw threads. Information ab
21、out this document This British Standard has been fully revised to bring it up to date. Presentational conventions The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”. Commentary, expl
22、anation and general informative material is presented in notes in smaller italic type, and does not constitute a normative element. Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appl
23、ication. Compliance with a British Standard cannot confer immunity from legal obligations. 1 4 - Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:27:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv BSI 2007This page deliberately left blank BS 919-1:2007 Licens
24、ed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:27:17 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20071 BS 919-1:2007 1 Scope This part of BS 919 specifies requirements for the following types of gauges intended for use in the checking of products with unified s
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