5/16" - Serrated Shakeproof Washer Internal Type J - Self Colour - Pack of 50

These internal 5/16" serrated shakeproof washers are manufactured from high quality steel and finished with a self colour coating. These washers feature a ring of inward-facing serrations that grip the underside of the fastener head. This locking mechanism increases friction and helps to prevent loosening that may be caused by vibration or rotation.Internal serrated shakeproof washers offer a clean profile, making them especially suitable for use in assemblies where the washer must sit within the fasteners diameter. Ideal for use with imperial threaded fasteners in electrical connections, electronics, and light mechanical assemblies.