Fender Washer Flat Washer Type Oversized Dimensional Standards ASME B18.21.1 Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size 5/16 in Inside Diameter 0.344 in Outside Diameter 5/8 in Maximum Thickness 0.063 in System of Measurement Inch Minimum Thickness 0.063 in Pack Size Small Pack Package Quantity 50