"DOC" wrote in message
.. .

" Jim Sehr" wrote in message
...
...

then off of my CNC lathe. And the threads also are stronger then cut
threads.

Rolled threads are stronger than cut threads?

Oh, yeah. By quite a bit, too.

The grain is a part of it; rolled threads, like forgings in general, impose
a grain flow that tends to follow the lines of stress. Rolling also avoids
cutting across the flow of the grain that's already in the wrought stock.

And you get some work-hardening from the rolling, which, beneficially, is
concentrated near the surface.

There are specs for some highly-loaded engineering applications that
actually require a stronger alloy if the threads are going to be cut rather
than rolled.

Ed Huntress