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 1/4 in Inside Diameter 1.375 in Outside Diameter 2 1/2 in Maximum Thickness 0.165 in System of Measurement Inch Minimum Thickness 0.165 in Color Clear Inside Diameter Tolerance 1.368-1.405 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C