BS 84-1956 惠氏直螺纹规范.pdf
《BS 84-1956 惠氏直螺纹规范.pdf》由会员分享,可在线阅读,更多相关《BS 84-1956 惠氏直螺纹规范.pdf(54页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 84:1956 Specification for Parallel screw threads of Whitworth form UDC 621.882.082.2 BS 84:1956 This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published
2、 under the authority of the General Council on 26 September 1956 BSI 02-2000 First published as BS 84:1918 and BS 92:1919 First revision as BS 84 (incorporating BS 92) May 1940 Second revision September 1956 The following BSI references relate to the work on this standard: Committee reference MEE/1/
3、12 Draft for comment CT(MEE)6884 ISBN 0 580 32662 4 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial orga
4、nizations: Admiralty* Air Ministry* Associated Offices Technical Committee Association of Consulting Engineers (Incorporated) British Chemical Plant Manufacturers Association British Compressed Air Society British Electrical and Allied Manufacturers Association* British Engineers Association* Britis
5、h Internal Combustion Engine Manufacturers Association British Iron and Steel Federation British Railways, The British Transport Commission* Central Electricity Authority and Area Boards Crown Agents for Oversea Governments and Administrations D.S.I.R. Mechanical Engineering Research Laboratory* Eng
6、ineering Equipment Users Association* Gas Council High Commission of India Institute of Marine Engineers Institute of Petroleum Institution of Civil Engineers Institution of Gas Engineers Institution of Heating and Ventilating Engineers Institution of Mechanical Engineers* Institution of Mechanical
7、Engineers (Automobile Division) Institution of Production Engineers* Locomotive and Allied Manufacturers Association* Ministry of Fuel and Power Ministry of Labour and National Service (Factory Department) Ministry of Supply* Ministry of Transport and Civil Aviation Ministry of Works National Coal B
8、oard National Physical Laboratory Radio Industry Council* War Office The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Committee entrusted with the preparation of this standard: Agricultural Engineers Association British Bolt,
9、Nut, Screw and Rivet Federation Cut Thread Screwing Tool Manufacturers Association Engineering Standards Co-ordinating Committee Gauge and Tool Makers Association Ground Thread Tap Association Machine Tool Trades Association National Association of Marine Engine Builders Scientific Instrument Manufa
10、cturers Association Society of British Aircraft Constructors Society of Motor Manufacturers and Traders Ltd. Telecommunication Engineering and Manufacturing Association Amendments issued since publication Amd. No.DateComments BS 84:1956 BSI 02-2000i Contents Page Co-operating organizationsInside fro
11、nt cover Forewordiii 1Scope1 2Nomenclature and definitions1 3Form of Whitworth screw threads1 4Classes of bolts and nuts1 5Standard diameter pitch series: limits and tolerances2 6Plated threads2 7Stainless steel bolts3 8Selected thread series3 a) Basic sizes b) Design sizes c) Tolerances 9Tolerances
12、 on effective diameter, pitch and flank angles4 10Designation of screw threads of Whitworth form4 11Gauges5 Appendix A Truncated Whitworth form threads with flat crests34 Appendix B Bases of tolerances and allowances for Whitworth form screw threads39 Appendix C Tolerances on pitch and angle in rela
13、tion to tolerance on effective diameter41 Appendix D Notes on the form of the crests of Whitworth threads42 Appendix E44 Figure 1 Basic form of Whitworth thread6 Figure 2 Effective diameter tolerance zones of recommended combinations of classes of bolts and nuts having Whitworth screw threads7 Figur
14、e 3 Tolerance zones for close class bolt and medium class nut 1/4in. B.S.W. (20 t.p.i.) illustrated8 Figure 4 Tolerance zones for medium class bolt with allowance and normal class nut. 1/4in. B.S.W. (20 t.p.i.) illustrated9 Figure 5 Tolerance zones for free class bolt with allowance and normal class
15、 nut. 1/4in. B.S.W. (20 t.p.i.) illustrated10 Figure 6 Effective diameter tolerance zones for Whitworth bolts and nuts, unplated or before plating, and after plating (cf. Figure 2) of sizes 3/4in. nominal size and smaller11 Figure 7 Tolerance zones for truncated Whitworth thread 1/4 in. B.S.W. (20 t
16、.p.i.) illustrated36 Figure 8 Crest forms resulting from different production methods43 Table 1 Basic sizes12 Table 2 Bolts Close class13 Table 3 Nuts Medium class14 Table 4 Bolts Medium class15 a) Nominal sizes up to and including 3/4in. b) Nominal sizes above 3/4in. Table 5 Nuts Normal class16 BS
17、84:1956 ii BSI 02-2000 Page Table 6 Bolts Free class17 a) Nominal sizes up to and including 3/4in. b) Nominal sizes above 3/4in. Table 7 Basic sizes18 Table 8 Bolts Close class19 Table 9 Nuts Medium class20 Table 10 Bolts Medium class21 a) Nominal sizes up to and including 3/4in. b) Nominal sizes ab
18、ove 3/4in. Table 11 Nuts Normal class22 Table 12 Bolts Free class23 a) Nominal sizes up to and including 3/4in. b) Nominal sizes above 3/4in. Table 13 Preferred diameters and pitches Fractional sizes24 Table 13a Preferred diameters and pitches Decimal sizes27 Table 14 Depths of thread for various pi
19、tches29 Table 15 Bolts Medium and free class allowances31 Table 16 Bolts Close class31 Table 17 Nuts Medium class32 Table 18 Bolts Medium class32 Table 19 Nuts Normal class33 Table 20 Bolts Free class33 Table 21 Basic data37 Table 22 Bolts and nuts all classes38 Table 23 Bolts and nuts all classes39
20、 Table 24 Nuts Close class44 Table 25 Nuts Close class45 Table 26 Nuts Close class46 BS 84:1956 BSI 02-2000iii Foreword This standard makes reference to the following British Standards: BS 919, Screw gauge limits and tolerances. BS 1157, Tapping drill sizes. BS 1916, Pt. 2. Guide to the selection of
21、 fits. BS 2517, Definitions for use in mechanical engineering. This revised British Standard has been prepared, under the authority of the Mechanical Engineering Industry Standards Committee, to supersede BS 84:1940, “Screw threads of Whitworth form”. It applies to threads of Whitworth form used for
22、 general engineering purposes and is not intended to apply to special applications such as those requiring interference fits. The standard includes tables of basic sizes, limits and tolerances for British Standard Whitworth (B.S.W.) and British Standard Fine (B.S.F.) screw threads. In addition it no
23、w 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.) pitch series have insufficiently fine pitches. The British Standard Pipe parallel thread series was incorporated in BS 84:1940 as a fine threa
24、d series for general engineering purposes, and though this series was not intended for pipe joints it has been extensively used on certain types of pipe fittings, such as unions, compression type connections, etc., where the pressure seal is not made on the threads. This has caused some confusion wi
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS 84-1956 惠氏直螺纹规范 84 1956 惠氏直 螺纹 规范
链接地址:https://www.31doc.com/p-3645252.html