Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Class 8.8 Finish Black Oxide For Screw Size #10 Inside Diameter 0.188 in Outside Diameter 1/2 in Maximum Thickness 0.094 in System of Measurement Inch Minimum Thickness 0.094 in Color Clear Inside Diameter Tolerance 0.183-0.196 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C