Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.21.1 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 1/2 in Maximum Thickness 0.18 in System of Measurement Inch Minimum Thickness 0.18 in Color Clear Inside Diameter Tolerance 1.615-1.67 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards Not Rated Maximum Temperature 350 Degrees C