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 3 in Inside Diameter 3 in Outside Diameter 5 1/2 in Maximum Thickness 0.284 in System of Measurement Inch Minimum Thickness 0.284 in Color Clear Inside Diameter Tolerance 3.115-3.19 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C