NOT KNOWN FACTUAL STATEMENTS ABOUT TYPES OF SCREW HEADS

also called the Robertson generate, its distinct layout is characterised by a square-formed socket in the screw head in addition to a square protrusion within the Device. The tool and the socket are the two a bit tapered. An external hex screw head is often called a hex head cap screw. The screw head is produced up of the six-sided fastener. There