The Daring Dufas writes:


Most guys in the trades call them Tek screws.

http://www.imperialinc.com/grp076.shtml

I see many different types, there. Thanks for that.

I guess I should have been a little more specific, in that I was looking
for a self-tapping screw that would easily penetrate soft or low-carbon
steel, like the one's I used on the Limey motorcycle frame. Is that a
special type, or do they all do that? I'm looking to use the screws to
punch through and lock up the louvre adj linkage on a forced air heat
register, which is stamped steel. Thnx.

nb