BS 93-2008 British Association (B A ) screw threads - Requirements《英国协会(B A )螺纹 要求》.pdf
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1、BS 93:2008British Association (B.A.) screw threads RequirementsICS 21.040.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2
2、008ISBN 978 0 580 60893 3The following BSI references relate to the work on this standard:Committee reference FME/9Draft for comment 08/30173466 DCPublication historyFirst published May 1919Second edition, May 1951Third edition, September 2008Amendments issued since publicationAmd. no. Date Text aff
3、ectedBS 93:2008 BSI 2008 iBS 93:2008ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions and symbols 14 Profile of British Association (B.A.) screw thread 25 Basic sizes of B.A. threads 36 Tolerance classes and limits of sizes, and tolerances, for B.A. threads 37 Gauges 4Annex
4、esAnnex A (informative) Basis of sizes of B.A. threads 12Annex B (informative) Bases of allowances and tolerances for B.A. threads 12Annex C (informative) Effect of errors in pitch and flank angle on the effective diameter 14Annex D (informative) Approximate inch equivalents of B.A. thread sizes 16B
5、ibliography 21List of figuresFigure 1 Basic form of B.A. thread 2Figure 2 Tolerance zones for a close class external thread and an internal thread 5Figure 3 Tolerance zones for a normal class external thread and an internal thread 5Figure 4 Example of effective diameter tolerance zones (Effective di
6、ameter tolerance zones for size 2 B.A. threads illustrated) 6List of tablesTable 1 Basic sizes of British Association (B.A.) screw threads 7Table 2 Limits and tolerances for close class external threads Sizes 0 B.A. to 10 B.A. 8Table 3 Limits and tolerances for normal class external threads Sizes 0
7、B.A. to 10 B.A. 9Table 4 Limits and tolerances for normal class external threads Sizes 11 B.A. to 16 B.A. 10Table 5 Limits and tolerances for internal threads Sizes 0 B.A. to 16 B.A. 11Table B.1 Summary of tolerance formulae 13Table D.1 Basic sizes of British Association (B.A.) screw threads Approxi
8、mate inch equivalents 16Table D.2 Limits and tolerances for close class external threads Sizes 0 B.A. to 10 B.A. Approximate inch equivalents 17Table D.3 Limits and tolerances for normal class external threads Sizes 0 B.A. to 10 B.A. Approximate inch equivalents 18Table D.4 Limits and tolerances for
9、 normal class external threads Sizes 11 B.A. to 16 B.A. Approximate inch equivalents 19Table D.5 Limits and tolerances for internal threads Sizes 0 B.A. to 16 B.A. Approximate inch equivalents 20Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to
10、21 and a back cover.BS 93:2008ii BSI 2008ForewordPublishing informationThis British Standard is published by BSI and came into effect on 30 September 2008. It was prepared by Subcommittee SFTSE/1, Screws and fasteners technical specification committee, under the authority of Technical Committee FME/
11、9, Nuts, bolts and accessories. A list of organizations represented on this committee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 93:1951, which is withdrawn.Relationship with other publicationsThis British Standard is intended for use with BS 919-2, w
12、hich specifies the corresponding screw gauges.Information about this documentThis British Standard has been fully revised to bring it up to date. This British Standard specifies the British Association (B.A.) system of screw threads, which comprises 17 graded metric sizes designated by the numbers 0
13、 to 16. Approximate inch equivalents are also given.Hazard warningsPresentational conventionsThe 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, explanation and general in
14、formative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British
15、 Standard cannot confer immunity from legal obligations.WARNING. Attention is drawn to the fact that, with the different screw thread forms available, there is the possibility of a mismatch, which is potentially hazardous. It is the responsibility of the designer of the end product to ensure that th
16、is possibility is reduced to a minimum. For further information on mismatches of screw thread systems see PD 6494. BSI 2008 1BS 93:20081 ScopeThis British Standard specifies limits of sizes, and tolerances, for single start parallel screw threads of British Association (B.A.) form. It is not applica
17、ble to screw threads associated with interference fits, such as those on the “metal ends” of studs and in the corresponding tapped holes.This British Standard specifies the following:a) basic sizes for B.A. threads, sizes 0 B.A. to 16 B.A.;b) limits of size, and tolerances, for close class and norma
18、l class external threads of sizes 0 B.A. to 10 B.A.;c) limits of size, and tolerances, for normal class external threads of sizes 11 B.A. to 16 B.A.;d) limits of size, and tolerances, for a single class of internal threads of sizes 0 B.A. to 16 B.A.2 Normative referencesThe following referenced docu
19、ments are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 919-2, Screw gauge limits and tolerances Part 2: Specification for gauges fo
20、r screw threads of Whitworth and B.A. formsBS 6528:1984, Glossary of terms for cylindrical screw threads3 Terms and definitions and symbols3.1 Terms and definitionsFor the purposes of this British Standard the terms and definitions given in BS 6528:1984 and the following apply.3.1.1 effective diamet
21、erdiameter of the pitch cylinderNOTE 1 This is the “simple” effective diameter, as distinct from the “virtual” effective diameter (see 3.1.2).NOTE 2 Also known as the pitch diameter.3.1.2 virtual effective diametereffective diameter of an imaginary thread of perfect pitch and flank angle, having the
22、 full depth of flanks, but clear at the crests and roots, which would just assemble with the actual thread over the prescribed length of engagementNOTE The “virtual” effective diameter exceeds the simple effective diameter in the case of an external thread, but is less than the simple effective diam
23、eter in the case of an internal thread, by an amount corresponding to the combined diametral effects due to any errors in the pitch and/or the flank angles of the thread.BS 93:20082 BSI 20083.2 SymbolsFor the purposes of this British Standard the following symbols apply.NOTE 1 These are repeated fro
24、m BS 6528:1984 for the convenience of users of this standard.D major diameter of internal thread D1minor diameter of internal threadD2effective diameter of internal thread (see Note 2)d major diameter of external threadd1minor diameter of external threadd2effective diameter of external thread (see N
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