It depends on the 'class' of work you are doing.
American machine screw types
May 31, 2007
23 Replies
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For just the odd missing screws/bolts situation. It looks like the solution to this problem is someone in the UK to tie up with someone in the USA and a packet of assorted small size UNC/UNF nuts and bolts go surface mail one way and a packet of various small size BA mainly / mm nuts and bolts goes back the other.
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
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US hardware is quite rare outside N America.
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Yeah, 6-32 and 4-40 two very common thread sizes in US, even today.
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