"DoN. Nichols" wrote in message
...
snip-------
And after all -- the pitch diameter is what really matters.
Hence the measuring over wires.

Enjoy,
DoN.


Yep, my point, exactly. All the rest does is cloud the issue. None of it
is close enough to use for proper threading.

Harold


Points well taken, but in this particular situation, I'm threading
5/16-40, internal, 3/16 deep to a solid bottom. Don't know any
way to check this so just wanted to get the numbers as close as I can.
Thanks.
Ken.