Tab Washer

A tab washer is a washer with one or more tabs that bend against a nut or bolt. It stops the fastener from turning loose.

A tab washer sits under a nut or bolt head and its tab is bent against a flat to stop the fastener turning. It often matches a nut and bolt of the same thread, and the tab is set with a spanner or pliers. A two tongue or long tab form can be used where a corner or edge is close by.

This kind of washer is often made in stainless steel. Stainless steel resists corrosion and suits outdoor or wet use. It also keeps its shape when tabs are bent.

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 with the material grade. On receipt, check the tab bends without cracking. Check the bore and outer diameter match the drawing.