Mil. Spec. Flat Washer, Flat Washer Type Mil-Spec, Dimensional Standards MS15795, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 7/16 in, Inside Diameter 0.5 in, Outside Diameter 1 1/4 in, Maximum Thickness 7/64 in, System of Measurement Inch, Minimum Thickness 1/16 in, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM A380, ASTM A582, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack