Split Lock Washer Finish Zinc Plated Material Steel For Screw Size #4 Inside Diameter 0.114 in Outside Diameter 0.253 in Maximum Thickness 0.034 in Minimum Thickness 0.034 in Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C40 to C50 Package Quantity 100