[HELP] 6" Fortis/Clausing lathe

[EdK]

(12-09-2016, 02:21 PM)Seanlogie Wrote: I've read somewhere ,can't remember where that there are some imperial threads that are near as not the same as some metric . Did i imagine reading this or is there some truth in it ?.

Sean

Here are a couple I can think of off the top of my head.

10TPI ~ M2.5
20TPI ~ M1.25

They're not exact but pretty close.

Ed