USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Grade 2, Finish Black Oxide, For Screw Size 3/4 in, Inside Diameter 0.813 in, Outside Diameter 2 in, Maximum Thickness 0.156 in, System of Measurement Inch, Minimum Thickness 0.156 in, Pack Size Small Pack, Rockwell Hardness B49, Thickness Tolerance +/-0.010 in, Package Quantity 450