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 5/8 in, Inside Diameter 0.172 in, Outside Diameter 1 3/4 in, Maximum Thickness 0.141 in, System of Measurement Inch, Minimum Thickness 0.141 in, Pack Size Small Pack, Rockwell Hardness B49, Thickness Tolerance +/-0.010 in, Package Quantity 650