On 10/06/2009 07:32 PM, CW wrote:
"Chris Friesen" wrote in message

A properly heat-treated screw is about as strong in shear strength as a
nail the same size as the shaft, but is stronger in pull-out.

Why a heat treated screw? Nails are dead soft.

Sorry for the delay...the heat treatment keeps it from being brittle
from work-hardening when the threads are rolled.

Chris