These forgefix spring lock washers ring shaped split at one point and bent into a helix this shape means that the washer exerts a spring force between the fasteners head and 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 examples would be