Lock Washer Lock Washer Type Internal Tooth Lock Finish Plain Material Stainless Steel For Screw Size #3 Inside Diameter 0.102 in Outside Diameter 0.215 in Maximum Thickness 0.01 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