Coupling Nut Material Grade/Class Grade 5 Material Steel Finish Zinc Plated Thread Size 1 1/2 In.-6 Thread Style Fully Threaded Hex Width 2 in Overall Length 3 1/2 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 C32