What are Bolts ?
A bolt is a form of threaded fastener with an external male thread. Bolts are thus closely related to, and often confused with, screws. Bolts are headed fasteners with external threads suitable for non-tapered nut. They require a nut (or some other thread) as a counter – to lock the joint. The bolts are made with uniform threads satisfying the standard specifications and are used in most industrial applications – secured with a spring-washer or a lock. In all, bolts are designed to use as a fastener placed through already drilled holes in the machine parts and these requires a nut to tighten it from the other end.