Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Class 10.9 Finish Zinc Yellow For Screw Size 1 3/8 in Inside Diameter 1.438 in Outside Diameter 2 3/4 in Maximum Thickness 0.25 in System of Measurement Inch Minimum Thickness 0.25 in Color Yellow Inside Diameter Tolerance 1.368-1.483 Made in North America No Manufacturer Location Globally Sourced Material Quality Standards ASTM A-325 Maximum Temperature 350 Degrees C