Coupling Nut Material Grade/Class Grade 5 Material Steel Finish Black Oxide Thread Size 3/8 In.-16 Thread Style Fully Threaded Hex Width 11/16 in Overall Length 1 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