Coupling Nut Material Grade/Class Grade 5 Material Steel Finish Black Oxide Thread Size 1/2 In.-13 Thread Style Fully Threaded Hex Width 7/8 in Overall Length 1 1/4 in Dimensional Standards RoHS Compliant with Excemption 6 Material Quality Standards Grade 2 System of Measurement Inch Thread Direction Right Hand Color Black Pack Size Small Pack Rockwell Hardness 85-90 Rockwell on 15N Scale