Coupling Nut Material Grade/Class Grade 2 Material Steel Finish Zinc Plated Thread Size 1 1/4 In.-12 Thread Style Fully Threaded Hex Width 1 5/8 in Overall Length 3 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