Fender Washer Flat Washer Type Oversized Dimensional Standards ASME B18.21.1 Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 1/2 in Inside Diameter 0.531 in Outside Diameter 1 3/4 in Maximum Thickness 0.065 in System of Measurement Inch Minimum Thickness 0.065 in Color Silver Maximum Temperature 302 Degrees F Minimum Temperature -58 Degrees F Pack Size Small Pack Rockwell Hardness Not Rated Thickness Tolerance 0.047 in to 0.080 in