5/16in SAE Thru-hardened Extra Thick Flat Washer Yellow Zinc

These extra thick flat washers have identical inside and outside diameters as SAE thru-hardened washers, but can be up to 50% thicker. Manufactured from a medium grade of steel and are heat-treated, the extra thick flat washer is designed for heavy duty use in machinery construction, assembly, in-plant maintenance and building construction. FW516XT