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 1 1/4 in Inside Diameter 1.281 in Outside Diameter 2 1/2 in Maximum Thickness 0.281 in System of Measurement Inch Minimum Thickness 0.281 in Color Clear Inside Diameter Tolerance 1.274-1.311 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C