Lock Washer Lock Washer Type Internal Tooth Lock Finish Zinc Plated Material Steel For Screw Size #6 Inside Diameter 0.15 in Outside Diameter 0.295 in Maximum Thickness 0.022 in Dimensional Standards ASME B18.21.1 For Use With Machine Screws and Nuts Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C40 to C50 System of Measurement Inch Thickness Tolerance -0.006 in Package Quantity 100