USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1 Type A Wide, USS Standard, Material Steel, Material Grade/Class Grade 8, Finish Zinc Yellow, For Screw Size 5/8 in, Inside Diameter 0.688 in, Outside Diameter 1 3/4 in, Maximum Thickness 9/64 in, System of Measurement Inch, Minimum Thickness 9/64 in, Color Yellow, Material Quality Standards ASTM F436, Pack Size Small Pack, Rockwell Hardness 38HRC, Thickness Tolerance +0.026/-0.026 in, Package Quantity 25