LITTLE KNOWN FACTS ABOUT KINDS OF SCREW HEADS.

A carriage bolt, also known as a coach bolt, has a domed or countersunk head, by using a shank topped by a short square portion beneath the head. Not like "frequent" bolts, a carriage bolt has a clean head that doesn't accept applications; alternatively, counter-rotation is provided by the square part of shank.The screw heads protrude from the fabr

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