SAE Washer, Flat Washer Type SAE, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Through Hardened, Finish Zinc Yellow, For Screw Size 1/2 in, Inside Diameter 0.531 in, Outside Diameter 1 1/16 in, Maximum Thickness 3/32 in, System of Measurement Inch, Minimum Thickness 1/8 in, Color Yellow, Material Quality Standards ASTM F436, Pack Size Small Pack, Rockwell Hardness RC38, Package Quantity 25