LITTLE KNOWN FACTS ABOUT KINDS OF SCREW HEADS.

A socket cap screw, generally known as a socket head capscrew, socket screw, or Allen bolt, is often a type of cap screw using a cylindrical head and hexagonal drive gap. The time period socket head capscrew generally refers to your type of threaded fastener whose head diameter is nominally one.5 periods that in the screw shank (significant) diamet