Wedge Lock Washer

A wedge lock washer is a two part washer with interlocking cams. It resists loosening under heavy vibration.

A wedge lock washer pairs two washers with cams that lock against each other and hold a bolted joint under vibration. It matches a bolt and nut of the same thread and class, and the pair is set with a spanner. It can be used on structural and machine joints where a standard washer would loosen.

This kind of washer is often made in steel, stainless steel or stainless steel 316. Steel types can have a zinc or Dacromet coating for corrosion resistance. Stainless steel 316 suits marine and chemical exposure.

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 and dimensions. On receipt, check the cam teeth for wear and the pair for free movement before fitting. Check the outer diameter and hole size against the bolt.