Lock Washer Lock Washer Type External Tooth Lock Finish Plain Material Stainless Steel For Screw Size #8 Inside Diameter 0.168 in Outside Diameter 0.365 in Maximum Thickness 0.018 in Dimensional Standards ASME B18.21.1 Material Grade/Class 410 Pack Size Small Pack Rockwell Hardness C40 System of Measurement Inch Package Quantity 50