Serrated Conical Washer

A serrated conical washer is a dished washer with teeth on the outer edge. It grips the surface and resists loosening when tightened.

A serrated conical washer sits under a nut or screw head and grips the surface with its teeth. It often takes the place of a plain washer where vibration can loosen the joint. It can be matched with a bolt or screw of the same thread and a nut where the joint is through bolted.

This kind of washer is often made in spring steel or stainless steel. The material affects corrosion resistance and spring properties.

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 if you need proof of material or dimensions. On receipt, check the teeth are sharp and the dish shape is even. Check the inside diameter fits your bolt.