USS Washer, Flat Washer Type USS, Dimensional Standards ASME B18.22.1, Material Steel, Material Grade/Class Grade 8, Finish Armor Coat, For Screw Size 7/16 in, Inside Diameter 0.5 in, Outside Diameter 1 1/4 in, Maximum Thickness 0.094 in, System of Measurement Inch, Minimum Thickness 0.094 in, Pack Size Small Pack, Resistance Properties , Rust , Rockwell Hardness C38, Tensile Strength 150,000 psi, Thickness Tolerance +/-0.010 in, Package Quantity 25