9/16" Grade 8 SAE Flat Washers, Extra Thick, 0.122" - 0.146" Thickness, Through Hardened, Grade 8 Steel, Yellow Zinc

Flat Washers are a thin, flat, circular steel part with a centrally located hole. Washers are designed for assembly around a bolt or screw, between the bearing surface of the fastener and the part to which it is attached. Flat washers are used to improve stress distribution and to span large clearance holes. Grade 8 through hardened flat washers are dimensionally similar to their USS washer counterparts, but with tighter tolerances on thickness, and manufactured from a higher grade of steel. They are to be used specifically with high-strength hardened steel bolts.