BS-84-2007.pdf
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1、BS 84:2007 Parallel screw threads of Whitworth form Requirements ICS 21.040.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued.
2、 BSI 2007 ISBN 978 0 580 57923 3 The following BSI references relate to the work on this standard: Committee reference FME/9 Draft for comment 07/30158483 DC Publication history First published as BS 84:1918 and BS 92:1919 Second edition as BS 84 (incorporating BS 92) May 1940 Third edition, Septemb
3、er 1956 Fourth edition, November 2007 Amendments issued since publication Amd. no.DateText affected BS 84:2007 BSI 2007i BS 84:2007 Contents Foreword iii 1Scope 1 2Normative references 1 3Terms and definitions and symbols 1 4Profile of Whitworth screw thread 2 5Tolerance classes of external and inte
4、rnal threads 3 6Limits of sizes, and tolerances, for uncoated B.S.W. and B.S.F. threads 3 7Limits of size, and tolerances, for B.S.W. and B.S.F. coated threads 4 8Stainless steel external threads 5 9Selected thread series 6 10Designation of screw threads of Whitworth form 8 11Gauges 8 Annexes Annex
5、A (normative) Truncated Whitworth form threads with flat crests 40 Annex B (informative) Bases of tolerances and allowances for Whitworth form screw threads 47 Annex C (informative) Tolerances on pitch and flank angle in relation to tolerance on effective diameter 50 Annex D (informative) Form of th
6、e crests of Whitworth threads 53 Annex E (normative) Limits and tolerances for close class internal threads for special uses 55 Bibliography 58 List of figures Figure 1 Basic form of Whitworth thread 9 Figure 2 Effective diameter tolerance zones of recommended combinations of classes of internal and
7、 external Whitworth form threads 10 Figure 3 Tolerance zones for a close class external thread and a medium class internal thread in B.S.W. (20 t.p.i.) illustrated 11 Figure 4 Tolerance zones for a medium class external thread with allowance and a normal class internal thread in B.S.W. (20 t.p.i.) i
8、llustrated 12 Figure 5 Tolerance zones for a free class external thread with allowance and a normal class internal thread in B.S.W. (20 t.p.i.) illustrated 13 Figure 6 Effective diameter tolerance zones for external and internal threads, uncoated or before coating, and after coating (c.f. Figure 2)
9、of sizes in nominal size and smaller 14 Figure A.1 Tolerance zones for truncated Whitworth threads (close class external thread and medium class internal thread) in B.S.W. (20 t.p.i.) illustrated 43 Figure D.1 Crest forms resulting from different production methods 54 List of tables Table 1 Coarse t
10、hread series (B.S.W.) Basic sizes 15 Table 2 Coarse thread series (B.S.W.) External threads Close class Limits and tolerances 16 1 4 - - 1 4 - - 1 4 - - 3 4 - - 1 4 - - BS 84:2007 ii BSI 2007 Table 3 Coarse thread series (B.S.W.) Internal threads Medium class Limits and tolerances 17 Table 4 Coarse
11、thread series (B.S.W.) External threads Medium class Limits and tolerances 18 Table 5 Coarse thread series (B.S.W.) Internal threads Normal class Limits and tolerances 19 Table 6 Coarse thread series (B.S.W.) External threads Free class Limits and tolerances 20 Table 7 Fine thread series (B.S.F.) Ba
12、sic sizes 21 Table 8 Fine thread series (B.S.F.) External threads Close class Limits and tolerances 22 Table 9 Fine thread series (B.S.F.) Internal threads Medium class Limits and tolerances 23 Table 10 Fine thread series (B.S.F.) External threads Medium class Limits and tolerances 24 Table 11 Fine
13、thread series (B.S.F.) Internal threads Normal class Limits and tolerances 25 Table 12 Fine thread series (B.S.F.) External threads Free class Limits and tolerances 26 Table 13A Selected thread series (Whit. S.) Preferred diameters and pitches Fractional sizes 27 Table 13B Selected thread series (Wh
14、it. S.) Preferred diameters and pitches Decimal sizes 31 Table 14 Selected thread series (Whit. S.) and non-standard threads Depths of thread for various pitches 34 Table 15 Selected thread series (Whit. S.) and non-standard threads External threads Medium and free class Allowances 37 Table 16 Selec
15、ted thread series (Whit. S.) and non-standard threads External threads Close class Tolerances 37 Table 17 Selected thread series (Whit. S.) and non-standard threads Internal threads Medium class Tolerances 38 Table 18 Selected thread series (Whit. S.) and non-standard threads External threads Medium
16、 class Tolerances 38 Table 19 Selected thread series (Whit. S.) and non-standard threads Internal threads Normal class Tolerances 39 Table 20 Selected thread series (Whit. S.) and non-standard threads External threads Free class Tolerances 39 Table A.1 Truncated threads Whitworth form Basic data 44
17、Table A.2 Truncated threads British Standard Whitworth (B.S.W.) series External and internal threads All classes Limits and tolerances 45 Table A.3 Truncated threads British Standard Fine (B.S.F.) series External and internal threads All classes Limits and tolerances 46 Table E.1 Coarse thread serie
18、s (B.S.W.) Internal threads Close class Limits and tolerances 55 Table E.2 Fine thread series (B.S.F.) Internal threads Close class Limits and tolerances 56 Table E.3 Selected and non-standard threads Internal threads Close class Tolerances 57 Summary of pages This document comprises a front cover,
19、an inside front cover, pages i to iv, pages 1 to 58, an inside back cover and a back cover. BSI 2007iii BS 84:2007 Foreword Publishing information This British Standard is published by BSI and came into effect on 30 November 2007. It was prepared by Subcommittee SFTSE/1, Screws and fasteners technic
20、al specification committee, under the authority of Technical Committee FME/9, Nuts, bolts and accessories. A list of organizations represented on this committee can be obtained on request to its secretary. Supersession This British Standard supersedes BS 84:1956, which is withdrawn. Relationship wit
21、h other publications This British Standard is intended for use with BS 919-2, which specifies the corresponding screw gauges. Information about this document This British Standard has been fully revised to bring it up to date. This British standard includes tables of basic sizes, limits and toleranc
22、es for British Standard Whitworth (B.S.W.) and British Standard Fine (B.S.F.) screw threads. In addition it provides a “Selected thread” series of recommended diameter/pitch combinations for use in applications where the standard coarse (B.S.W.) and fine (B.S.F.) series have insufficiently fine pitc
23、hes. An allowance (minimum clearance) is provided on certain classes of external threads of sizes up to and including in diameter; the recommended combinations of classes of internal threads and external threads include internal threads having larger effective diameter tolerances than the correspond
24、ing sizes of external threads. Three tolerance classes are specified for external threads, close, medium and free. The allowance is provided for medium class and free class external threads by specifying maximum external thread limits below the basic size. The purpose of this allowance is to provide
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