USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Through Hardened, Finish Zinc Yellow, For Screw Size 1 in, Inside Diameter 1.063 in, Outside Diameter 2 1/2 in, Maximum Thickness 1/8 in, System of Measurement Inch, Minimum Thickness 11/64 in, Color Yellow, Material Quality Standards ASTM F436, Pack Size Small Pack, Rockwell Hardness RC38, Package Quantity 10