Washer, Flat Washer Type Standard, Dimensional Standards TCMA, Material Steel, Material Grade/Class Not Graded, Finish Black Oxide, For Screw Size 1/2 in, Inside Diameter 0.531 in, Outside Diameter 1 1/8 in, Maximum Thickness 0.204 in, System of Measurement Inch, Minimum Thickness 0.172 in, Color Black, Maximum Temperature 400 Degrees F, Thickness Tolerance +/-1/64 in, Package Quantity 25