These Forgefix Spring Lock Washers ring-shaped, split at one point & bent into a helix. This shape means that the washer exerts a spring force between the fastener's head & the base item. The main purpose of the Spring Washer is to prevent loosening of the fastener by either movement or vibration. These washers are bright zinc plated for increased corrosion resistance. Application: Ideal for all manner of bolting applications where movement or vibration may cause loosening. Typical examp