On Jan 6, 3:00*pm, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:
"Existential Angst" fired this volley :

I figger that's gotta be the explanation?
I know about form tapping, just never heard of form-threading, which I
assume must exist.

Assuming the threads were cut, they'd have to begin with a blank that had
the thread area larger than the rest. *

But that's not the standard way "screw machine" equipment works on cheap
fasteners. *Not only does roll forming exist, it is the standard way by
which its done in mass-production.

They don't even use a "forming die", they use flat forming plates between
two of which the stock is rolled under extreme pressure to create the
threads.

LLoyd

Not just cheap fasteners, though?
I thought roll-formed threads were stronger than cut.

Dave