Split Lock Washer Finish Black Oxide Material Steel For Screw Size 2 1/4 in Inside Diameter 2.262 in Outside Diameter 3.398 in Maximum Thickness 0.496 in Minimum Thickness 0.496 in Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 Package Quantity 5