On Aug 17, 9:17*am, Spehro Pefhany
wrote:
What would be my best bet for getting a relatively small quantity
(current requirement is 100 pieces) of machine screws (a couple of
sizes, like 6-32) made from 0.25" dia. metal rod. The material (Nb) is
soft like copper and generally nasty to machine. I'd like a Torx or
similar head so it's not as easy to screw up as a slot.

Ideas? Real screw-making machines - heading and thread forming- look
like a bit much for the purpose (thousands of pounds and many HP). *

Main idea: convert to rivets.

Lesser ideas: heads of the 12-point style are easily driven and
formed, might
give better strength than an internal socket. You can probably roll
threads
easily enough, the first size down from 0.25" rod is 1/4-28.

The table says yield strength is closer to stainless than to copper.