Split Lock Washer Lock Washer Type Split Lock Finish Zinc Plated Material Alloy Steel For Screw Size 1/2 in Inside Diameter 0.512 in Outside Diameter 0.869 in Maximum Thickness 0.125 in Minimum Thickness 0.125 in Color Yellow Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 System of Measurement Inch Thickness Tolerance 0.000/+0.010 in Package Quantity 3750