Flat Washer Flat Washer Type Standard Dimensional Standards ASME B18.5 ASTM F-436 Material Steel Material Grade/Class Grade 2 Finish Zinc Yellow For Screw Size 7/16 in Inside Diameter 0.5 in Outside Diameter 1 1/4 in Maximum Thickness 0.084 in System of Measurement Inch Minimum Thickness 0.084 in Color Yellow Pack Size Bulk Pack Rockwell Hardness RC38 Thickness Tolerance +/-0.020 in Package Quantity 2000