Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Class 4 Finish Black Oxide For Screw Size 1/2 in Inside Diameter 0.531 in Outside Diameter 1 1/8 in Maximum Thickness 0.125 in System of Measurement Inch Minimum Thickness 0.125 in Color Clear Inside Diameter Tolerance 0.526-0.546 Made in North America No Manufacturer Location Globally Sourced Maximum Temperature 350 Degrees C Minimum Temperature -58 Degrees C