Flat Washer Flat Washer Type Oversized Dimensional Standards ASME B18.22.1 Material Stainless Steel Material Grade/Class 18-8 Finish Plain For Screw Size 5/16 in Inside Diameter 0.344 in Outside Diameter 11/16 in Maximum Thickness 0.094 in System of Measurement Inch Minimum Thickness 0.094 in Pack Size Small Pack Package Quantity 50