Lock Nut, Finish Zinc Plated, Material Steel, Material Grade/Class Grade 2, Thread Size 1 1/2 In.-6, Hex Width 2 1/4 in, Hex Height 1 5/16 in, Lock Type Nylon Insert, System of Measurement Inch, Hex Type Standard Hex, Thread Direction Right Hand, Insert Material Nylon, Pack Size Small Pack, Rockwell Hardness C28 Max.