Coupling Nut, Material Grade/Class Grade 8, Material Steel, Finish Zinc Plated, Thread Size 5/8 In.-11, Thread Style Fully Threaded, Hex Width 15/16 in, Overall Length 2 1/8 in, Dimensional Standards ASME B18.2.2, RoHS Compliant, Material Quality Standards SAE J995, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness C24-C34, Package Quantity 2