Mil Spec Washer Flat Washer Type Mil-Spec Dimensional Standards MS15795 Material Stainless Steel Material Grade/Class 18-8 Finish NL-19 For Screw Size 1/4 in Inside Diameter 0.281 in Outside Diameter 5/8 in Maximum Thickness 0.08 in System of Measurement Inch Minimum Thickness 0.051 in Color Silver Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness B70 Thickness Tolerance +0.051 to 0.080 in Package Quantity 50