“S” & “VS” Type Serrated Safety Washers

Serrated Washers are Coned Washers with Trapezoidal Ribs across the cross section on both sides for gripping. They are primarily used to sustain preload and avoid loosening. As the bolt is tightened the serrations crunch into the mating surfaces and prevent the screw from loosening due to vibration. The disc shape holds the necessary pre-tension. The diameters for Serrated Washers are matched to screw dimensions. The outer diameter of the washer is matched to the diameter of the screw head. This allows using screw and bolt including recessed heads, except countersunk screw.