Split Lock Washer Lock Washer Type Split Lock Finish Black Oxide Material Steel For Screw Size 1 1/2 in Inside Diameter 1.534 in Outside Diameter 2.419 in Maximum Thickness 0.375 in Minimum Thickness 0.375 in Color Black Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 System of Measurement Inch Thickness Tolerance +/-0.020 in Package Quantity 10