Transcription of ISO metric screw threads
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BRITISH STANDARDBS 3643-1:1981(Reprinted, incorporating Amendments No. 1 and No. 2)Specification forISO metric screw threads Part 1: Principles and basic dataUDC copy:PONTYPRIDD COLLEGE, 26/10/2006, Uncontrolled Copy, BSIBS3643-1:1981 This British Standard, having been prepared under the direction of the Mechanical Engineering Standards Committee, was published underthe authority of the Executive Board and comes intoeffect on 31 March 1981 BSI 02-1999 First published June 1963 First revision March 1981 The following BSI references relate to the work on this standard:Committee reference MEE/1 Draftfor comment 78/80250 DCISBN 0 580 11626 3 Cooperating organizationsThe Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following:The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard:Associated Offices Technical CommitteeDepartment of Trade (Marine Division)Association of
modified bolt root profile. This information has been included in this standard. Screw thread terms and definitions can be found in BS 6528 (identical with ISO5408-1983) and these will be adopted in future standards and revised existing standards. Some terms used in this standard, based on the established ISO standards, may
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