Flat Washer, Flat Washer Type Standard, Dimensional Standards TCMAI standards, Material Steel, Material Grade/Class Not Graded, Finish Black Oxide, For Screw Size 1 1/4 in, Inside Diameter 1.281 in, Outside Diameter 2 1/2 in, Maximum Thickness 0.297 in, System of Measurement Inch, Minimum Thickness 0.265 in, Color Black, Maximum Temperature 400 Degrees F, Thickness Tolerance +/-1/64 in, Package Quantity 10