Metrickery

[Profpointy]

Which thread would you use? Imperial is that bad that they cant even decide on a standard thread system. At least with metric, the thread form is the same it is only the pitch that changes and everyone knows that a 12mm bolt would be a closer size to 1/2" rather than 10mm.

You can't really blame imperial-ness for there being more.than one thread standard. After all a (metric) bottom bracket thread ain't gonna be M32 is it? There are different threads recommended for different purposes and materials whatever units.they're specified in. For example I believe BA threads are metric. And the thread on a DIN (ie german standard, now universally adopted) diving valve is 5/8 BSP (british standard pipe)