Castle Nut, Finish Plain, Material Steel, Material Grade/Class Grade 8, Thread Size 1 1/2 In. -6, Hex Width 2 1/4 in, Hex Height 55/64 in, Hex Type Standard Hex, Lock Type Slotted Castle, Dimensional Standards ASME B 18.2. 2, System of Measurement Inch, Thread Direction Right Hand, Overall Height 1 9/32 in, Pack Size Small Pack