Awl --

I got a hardware-store eye-bolt, 1/4-20, garden variety, not welded or cast.

The thread measures .246 -- no pro'leng.
But the part of the rod that forms the eye measures .210-.215.... !!

Shouldn't the eyebolt measure .246 *everywhere*?

Or did they form-thread .215 rod, with the threads now deformed out to
..246?
I figger that's gotta be the explanation?
I know about form tapping, just never heard of form-threading, which I
assume must exist.

--
EA