Not a software question, but can anyone here help? I restoring an old item manufactured in the US in approx the 70's or 80's. There are several bolt sizes used, but if I can identify one type I should be able to identify the rest! At the moment all I can say is it about M6 diameter but a coarser thread. Is this likely to be a UNC or UNF type? They are a hex button type head, so I am presuming they are 1/8" or 3/16" Alan key sockets or did the US use another type?
I shall do some more research but any thoughts would be appreciated.