Lock Washer Lock Washer Type Internal Tooth Lock Finish Plain Material Stainless Steel For Screw Size 1/4 in Inside Diameter 0.256 in Outside Diameter 0.46 in Maximum Thickness 0.023 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