Fitted Stud

A fitted stud is a threaded rod with threads at both ends or along its full length. It joins parts where a bolt cannot be turned from the head side.

A fitted stud screws into a tapped hole and takes a nut on the free end. It often joins a flange or a cover that is taken apart later. It can be set with a stud driver or two nuts locked together.

Hot dip galvanising gives a thick zinc coating for outdoor and wet service. Plain finish has no coating and is for dry, indoor use or where a coating would interfere. PTFE coating lowers friction and helps with release, and it gives some corrosion protection.

Fitted studs are often made in stainless steel 304, stainless steel 316, high tensile steel, mild steel or brass. Stainless steel 316 gives better corrosion resistance than 304 in chloride conditions. Brass is non magnetic and resists corrosion in some environments.

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 and a mill test certificate for the material. On receipt, check the thread form, length and straightness. Look for damaged threads, cracks or coating defects.