Lock Washer Lock Washer Type External Tooth Lock Finish Plain Material Stainless Steel For Screw Size 1/2 in Inside Diameter 0.512 in Outside Diameter 0.898 in Maximum Thickness 0.039 in Color Silver Dimensional Standards ASME B18.21.1 For Use With - Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness B85 System of Measurement Inch Thickness Tolerance 0.045 in to 0.037 in Package Quantity 25