BS 3643-1:2007 ISO metric screw threads. Principles and basic data
Provides information on principles, basic data and calculating limits of size.
Supersedes BS 3643-1:1981. Came into effect 30 November 2007.
British Standards Institution
With over 100 years of experience the British Standards Institute is recognised as the UK’s National standards body. Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards.
389 Chiswick High Road