USS Washer Flat Washer Type USS Dimensional Standards ASME B18.22.1 Material Steel Material Grade/Class Grade 8 Finish Zinc Yellow For Screw Size 1 1/2 in Inside Diameter 1.625 in Outside Diameter 3 1/2 in Maximum Thickness 0.112 in System of Measurement Inch Minimum Thickness 0.125 in Color Yellow Material Quality Standards ASTM F436 Pack Size Small Pack Rockwell Hardness RC38 RoHS Compliant No Package Quantity 150