A socket cap screw, generally known as a socket head capscrew, socket screw, or Allen bolt, can be a type of cap screw having a cylindrical head and hexagonal push hole. The expression socket head capscrew normally refers to the type of threaded fastener whose head diameter is nominally 1.five https://garrettyzwtq.ampblogs.com/facts-about-types-of-screw-heads-uk-revealed-66188125