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 1 3/4 in Inside Diameter 1.875 in Outside Diameter 4 in Maximum Thickness 0.18 in System of Measurement Inch Minimum Thickness 0.18 in Color Clear Inside Diameter Tolerance 1.865-1.92 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C