Jam Nut, Hex Type Thin/Low Hex, Finish Black Oxide, Material Steel, Material Grade/Class Not Graded, Thread Size 1 3/4 In.-12, Hex Width 2 5/8 in, Hex Height 1 in, Dimensional Standards ASME B18.2.2, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness B68 to C32, Thread Type Fine