Square Weld Nut

A square weld nut is a nut with a square shape and projections for welding. It is welded to a metal part to provide a threaded hole.

A square weld nut is welded to a metal part to provide a threaded hole for a bolt. It is often used where the square shape gives a larger weld area or resists turning better than a round nut. The nut takes a bolt of the same thread and class, and the weld is made with a welding machine or a stud welder.

Square weld nuts are often made in low carbon steel. This material is easy to weld and form.

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 to confirm the dimensions and material. On receipt, check the thread and the weld projections. Check that the nut sits flat against the mating surface.