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BS 3643-1:2007 ISO metric screw threads. Principles and basic data (incorporating corrigendum No. 1)
Provides information on principles, basic data and calculating limits of size.
Supersedes BS 3643-1:1981. Came into effect 30 November 2007. First published June 1963. Second edition, March 1981. Third edition, November 2007. Amendment C1 dated August 2009 - Figure A.1b corrected, Annex B, Example 1, d3 corrected to d1 in four places, Annex B, Example 2, correction to formula for maximum pitch diameter.
British Standards Institution
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