Question on Grip Screws

[sheepherder]

All right, let's not get frivolous here...This is serious business...

Originally Posted by SIGP2101

How about using a simple thread gauge to find out.

Because there are only 3 threads on a grip screw, and the difference between 30 & 32 tpi won't show up until you get more threads to measure...

The blueprint clearly says Whitworth (pic below)...In 3/16" Whitworth, 24 tpi is coarse, 32 tpi is fine...There doesn't seem to be any 30tpi...as standard, anyway...