Flat Washer Flat Washer Type USS Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size 2 in Inside Diameter 2.125 in Outside Diameter 4 1/2 in Maximum Thickness 0.18 in System of Measurement Inch Minimum Thickness 0.18 in Color Clear Inside Diameter Tolerance 2.115-2.17 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C