Hi,
Thanks for the replies, I should have said that the tooling end is MT3 which has 2 different threads applicable and since the nut is a cast item from Hemingway, I wanted to use the same nut with two different bars having the same thread at the nut end and M12 or 3/8Whit on the other end.
So, really I just need to know whether thre is any advantage of using a finer thread at the nut end than at the tooling end, and specifically whether M12x1.0 is OK or should I stick to ISO M12 ?
As I said, I'm sure I'm over-thinking it :-)
Thanks,
Boo