Flange Nut

A flange nut is a hex nut with a built-in washer-like flange at one end. The flange spreads the clamping load over a wider area and can reduce the need for a separate washer.

A flange nut tightens onto a bolt or stud. Its flange spreads the load over a wider area and can remove the need for a separate washer. It often matches a bolt or stud of the same thread and class.

Zinc plating gives a thin, bright coating for general indoor use and mild conditions. Hot-dip galvanising gives a thicker zinc layer for outdoor and corrosive exposure. Plain finish has no added coating and suits dry, controlled conditions.

This kind of nut is often made in steel, stainless steel 304, stainless steel 316 or brass. Steel grades can be selected for strength, while stainless steel grades suit corrosion resistance. Brass is often chosen for electrical or decorative work.

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, where relevant, a mill test certificate for the material. On receipt, check the thread fit, the flange face and the finish appearance. Confirm the marking on the nut matches the grade you ordered.