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 7/8 in Inside Diameter 0.906 in Outside Diameter 1 3/4 in Maximum Thickness 0.156 in System of Measurement Inch Minimum Thickness 0.156 in Color Clear Inside Diameter Tolerance 0.899-0.921 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C