Jam Nut, Hex Type Heavy Jam, Finish Black Oxide, Material Steel, Material Grade/Class Grade A, Thread Size 1/2 In.-13, Hex Width 7/8 in, Hex Height 19/64 in, Dimensional Standards ASME B18.2.2, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Thread Type Coarse, Package Quantity 50