5/16in USS Thru-hardened Flat Washer Yellow Zinc

Designed for assembly around a high-strength hardened steel bolt between the bearing surface of the fastener and what it is attached to, these thru-hardened flat washers are used to improve stress distribution and to span large clearance holes. They have tighter tolerances on thickness than a Low Carbon flat washer. USS washers meet the majority of industrial applications in manufacturing, maintenance and repair. FW516C8