Coupling Nut Material Grade/Class Grade 2 Material Steel Finish Zinc Plated Thread Size 5/16 In.-18 Thread Style Fully Threaded Hex Width 1/2 in Overall Length 1 3/4 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 Package Quantity 10