RS PRO Steel Bright Zinc External Tooth Locking Washer, M3M20, DIN 6797 A

From the reliable RS PRO brand, this external tooth lock washer provides superior security for fixings and fastenings. Like standard washers, it distributes the load of a bolt against a surface material. However, its unique locking action prevents the fastener from turning, reducing the likelihood of the fixing loosening over time or under repeated stress. This makes it particularly useful in applications where vibration is a concern.