Hex Nut, Hex Type Heavy Hex, Finish Black Oxide, Material Grade/Class Grade 2H, Material Steel, Thread Size 1 1/2 In.-6, Hex Width 2 3/8 in, Hex Height 1 15/32 in, Material Quality Standards ASTM A194, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Removable Yes, Rockwell Hardness C24 to C38, Thread Type Coarse