Flat Washer Flat Washer Type SAE Dimensional Standards ASME B18.21.1 SAE Material Steel Material Grade/Class Grade 2 Finish Black Oxide For Screw Size 1 1/2 in Inside Diameter 1.625 in Outside Diameter 3 in Maximum Thickness 0.165 in System of Measurement Inch Minimum Thickness 0.165 in Color Clear Inside Diameter Tolerance 1.618-1.655 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C