Split Lock Washer, Lock Washer Type Split Lock, Finish Black Oxide, Material Steel, For Screw Size 7/16 in, Outside Diameter 0.644 in, Maximum Thickness 0.14 in, Minimum Thickness 0.14 in, Dimensional Standards ASME B 18.21. 1, Material Grade/Class Not Graded, Pack Size Small Pack, Resistance Properties Vibration Resistant, Rockwell Hardness C46, System of Measurement Inch, Package Quantity 100