USS Washer Flat Washer Type USS Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 7/16 in Inside Diameter 0.5 in Outside Diameter 1 1/4 in Maximum Thickness 0.078 in System of Measurement Inch Minimum Thickness 0.078 in Pack Size Bulk Pack Thickness Tolerance 0.064 to 0.104 in Package Quantity 2050