Square Nut, Material Grade/Class Not Graded, Material Steel, Finish Zinc Plated, Thread Size 1/2 In. -13, Square Height 29/64 in, Square Width 13/16 in, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness B68 to C32, Thread Type Coarse, Package Quantity 50. This item has been restricted from sale in the following state (s): []