Split Lock Washer Lock Washer Type Split Lock Finish Plain Material Stainless Steel For Screw Size 5/16 in Inside Diameter 0.322 in Outside Diameter 0.457 in Maximum Thickness 0.093 in Minimum Thickness 0.093 in Dimensional Standards ASME B18.21.1 Material Grade/Class 18-8 Pack Size Small Pack Rockwell Hardness C35 System of Measurement Inch Package Quantity 100