Split Lock Washer Finish Black Oxide Material Steel For Screw Size #6 Inside Diameter 0.141 in Outside Diameter 0.314 in Maximum Thickness 0.045 in Minimum Thickness 0.045 in Color Black Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 Thickness Tolerance +0.006 in Package Quantity 100