9/16 SAE Flat Washer Extra Heavy/Thick Yellow Zinc Plated

9/16 SAE Flat Washer Extra Heavy/Thick Yellow Zinc Plated . Extra thick SAE Washers are produced to comply with Society of Automotive Engineers specifications. They are of smaller O.D. and thinner gauges than their counterpart bolt sizes of U.S. Standard Washers. These are hardened and plated yellow zinc. For use with high carbon steel bolts and nuts.