Flat Washer, Flat Washer Type USS, Dimensional Standards ASME B18.21.1, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 5/16 in, Inside Diameter 0.375 in, Outside Diameter 7/8 in, Maximum Thickness 0.083 in, System of Measurement Inch, Minimum Thickness 0.083 in, Pack Size Small Pack, Rockwell Hardness Not Rated, Package Quantity 50