Flat Washer, Flat Washer Type Standard, Dimensional Standards ANSI B 18.22. 1, Material Stainless Steel, Material Grade/Class 18-8, Finish NL-19, For Screw Size 5/16 in, Inside Diameter 0.344 in, Outside Diameter 3/4 in, Maximum Thickness 3/64 in, System of Measurement Inch, Minimum Thickness 3/64 in, Color Silver, Material Quality Standards Not Applicable, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Rockwell Hardness B70, Thickness Tolerance +/- 0.005 in, Package Quantity 50. This item has been restricted from sale in the following state (s): []