Split Lock Washer Lock Washer Type Split Lock Finish Armor Coat Material Steel For Screw Size 1/2 in Inside Diameter 0.512 in Outside Diameter 0.879 in Maximum Thickness 0.125 in Minimum Thickness 0.125 in Color Silver Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C33 System of Measurement Inch Thickness Tolerance +/-0.006 in Package Quantity 25