SAE Washer Flat Washer Type SAE 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 in Maximum Thickness 0.136 in System of Measurement Inch Minimum Thickness 0.177 in Color Yellow Material Quality Standards ASTM F436 Pack Size Small Pack Rockwell Hardness RC38 Package Quantity 5