• International Industrial Springs

Serrated Safety Washers

IIS serrated safety washers are ready to fit washer to sustain preload and avoid loosening. When the screw is tightened, the serrations crunch into the mating faces and prevents the screw from loosening up due to vibrations, etc. Also the disc shape supports to hold the necessary tension. These are available in various sizes to fit bolts/screws. Serrated washers are disc springs with trapezoidal cross section on both sides for gripping. The diameters for serrated washer are matched to screw dimensions. The outer diameter of washer is matched to the head diameter of pan head. This allows using the serrated safety washers with almost every screw and bolt including recessed heads except countersunk screw. Advantages: used for high vibration resistance due to positive rib contact; excellent pretensioning; through proper radius selection, no splitting/cracking occurs during tightening; the concentric force of the washer eliminates the chances of bending the fastener; and extensive application and flexibility. I