Lock Washer Lock Washer Type Internal Tooth Lock Finish Plain Material Phosphor Bronze For Screw Size #10 Inside Diameter 0.204 in Outside Diameter 0.381 in Maximum Thickness 0.024 in Color Bronze Dimensional Standards ASME B18.21.1 For Use With Small Screw Heads Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness B90 System of Measurement Inch Thickness Tolerance 0.018 in to 0.024 in Package Quantity 100