Serrated Washers are Disc Springs with Trapezoidal Cross Section on both sides for gripping. IIS serrated safety washers are ready to fit washers to sustain preload and avoid loosening. As the bolt is tightened the serrations crunch into the mating faces and prevents the screw from loosening up due to vibration. Also, the disc shape holds the necessary tension. They are available in various sizes to fit bolts or screws. The diameters for Serrated Washers are matched to screw dimensions. The outer diameter of washer is matched to the head diameter of screw head. This allows using screw and bolt including recessed heads, except countersunk screw.

IIS Manufactures and Stock Belleville Washers in Imperial as well as Metric Sizes. Belleville Washer are also called as Conical Springs Washers and are made as over DIN 6796 and are designed specifically for Heavy Duty Bolted Section such as Bus Bars, Transformers, Rectifiers, Heat Exchangers, Transmission, etc. These Washers are intended to counteract the effect of setting which results in BoltNut assembled working Loose. They do not effectively prevent loosening of the assembly under varying Redial Load and are designed for use with short bolts predominantly subject to thrust.

Serrated safet Washers are ready to fit washer to sustain preload and avoid loosening. When you Tighten the Screw, 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. They are available in various size for Bolts and Screws. Serrated Washers are Disc Springs with Trapezodial Cross Section on Both Sides for gripping. The Diameters for Serrared Washer are matched to screw dimensions. The Outer Diamater of Washer is matched to the head diamater of pan head. This allows using the Serrated Safety Washers with almost every Screw and Bolt including recessed heads except countershunk screw.

International Springs Wave washers are as per DIN 137 & DIN 6904. International Springs Wave Washers are made from prime Quality Spring Steel. Stainless Steel and Copper are also available in standard sizes. Wave Washers are positioned underneath a nut, an axle bearing, or a joint, to reduce friction, avoid leakage, isolate, stop loosening or distribute pressure