In article ,
"Tim Sampson" writes:
Hi

I need to get some 3/6" x 6" bolts and I am told they are 'UNC', whatever
that means. Does anyone have a source for US size bolts?

UNC -- Unified National Course
UNF -- Unified National Fine

I assume 3/6" is meant to be 3/16"?

Actually, the UK was partly responsible for these standards, but
didn't adopt them when they were finalised.

--
Andrew Gabriel