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.
Figure 1 — Basic profile of ISO metric thread 1 Figure 2 — Basic dimensions 6 Figure 3 — Tolerance positions with respect to zero line ... (other than the coarse pitch) and therefore these pitches have been included in ... 6H and 7H for internal threads and4h, 6g and 8g for external threads where appropriate
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