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 3/16 in Inside Diameter 0.25 in Outside Diameter 9/16 in Maximum Thickness 0.047 in System of Measurement Inch Minimum Thickness 0.047 in Color Silver Inside Diameter Tolerance 0.245-0.265 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C