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 Hot Dipped Galvanized For Screw Size 3/4 in Inside Diameter 0.813 in Outside Diameter 2 in Maximum Thickness 0.177 in System of Measurement Inch Minimum Thickness 0.122 in Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness 38HRC Thickness Tolerance +/-0.027 in Package Quantity 45