Flange Stud

A flange stud is a threaded rod with a flange or collar that seats against a mating surface. It joins flanged pipework and similar assemblies.

A flange stud fastens flanged joints and similar assemblies. It often takes a nut and a washer of the same thread and class. A spanner or socket sets it.

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.

Flange 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 flange dimensions. Look for damaged threads, cracks or coating defects.