Mil. Spec. Flat Washer, Flat Washer Type Mil-Spec, Dimensional Standards AN960, QQ-P-35, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size #4, Inside Diameter 0.125 in, Outside Diameter 5/16 in, Maximum Thickness 3/64 in, System of Measurement Inch, Minimum Thickness 1/64 in, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM A582, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack