Hexagon Bolt And Setscrew

Hexagon bolts and setscrews are threaded fasteners with a hexagonal head. Bolts usually fasten parts together with a nut, while setscrews often hold a part in place against a shaft or within a threaded hole.

A hexagon bolt or setscrew clamps two or more parts through a drilled hole. It takes a nut and often a washer of the same thread and class. A setscrew often has a fully threaded shank and can be used without a nut in a tapped hole.

This kind of fastener is often made in steel. The material can affect strength and corrosion resistance.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance for the batch. On receipt, check the head marking, thread condition and surface finish.