Self-Locking Washer

A self-locking washer is a retaining washer that grips a stud, rod or pin to hold it in place. It resists vibration and prevents the fastener from loosening.

A self-locking washer grips a stud, rod or pin and holds its position without a nut. It often suits insulation pins and threaded rods where a fixing must stay put. The washer can be matched with a stud or rod of the same thread and a panel or bracket.

This kind of washer is often made in aluminium or stainless steel. Aluminium suits light duty and stainless steel gives better corrosion resistance.

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 material test certificate. On receipt, check the washer dimensions, the locking action and the surface finish.