Mil. Spec. Flat Washer, Flat Washer Type Mil-Spec, Dimensional Standards NAS620, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size #4, Inside Diameter 0.115 in, Outside Diameter 13/64 in, Maximum Thickness 1/64 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