Stud Bolt

A stud bolt is a threaded rod with threads at both ends, often used with nuts to clamp flanges or heavy components. It can be threaded full length or have an unthreaded shank.

A stud bolt passes through two flanges or parts and takes a nut at each end. It often matches a heavy hex nut and a flat washer of the same thread and class. Stud bolts suit flanged joints, pipework and pressure equipment.

Zinc plating gives a thin coating for general indoor or mild outdoor use. Hot-dip galvanising gives a thicker zinc layer for outdoor and corrosive conditions. Both finishes are applied to steel studs, while stainless steel studs are usually supplied without these coatings.

Stud bolts are often made in alloy steel, carbon steel, stainless steel 304 or stainless steel 316. Alloy steel grades such as B7 are common for high-temperature or high-pressure service. Stainless steel grades suit corrosive environments.

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

Ask for a mill test certificate for the steel and a certificate of conformance. On receipt, check the thread dimensions, straightness and grade markings. Confirm the finish thickness if galvanised, and check for damage to the threads.