USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1 Type A Wide, USS Standard, Material Steel, Material Grade/Class Grade 2, Finish Zinc Plated, For Screw Size 2 in, Inside Diameter 2.125 in, Outside Diameter 4 1/2 in, Maximum Thickness 0.213 in, System of Measurement Inch, Minimum Thickness 0.153 in, Pack Size Small Pack, Resistance Properties , Rockwell Hardness 38HRC, Thickness Tolerance +/-0.030 in, Package Quantity 8