Coupling Nut Material Grade/Class Grade 2H Material Steel Finish Black Oxide Thread Size 3/8 In.-16 Thread Style Fully Threaded Hex Width 11/16 in Overall Length 1 3/4 in Dimensional Standards ASME B18.2.2 Material Quality Standards ASTM A194 2H System of Measurement Inch Thread Direction Right Hand Pack Size Small Pack Rockwell Hardness 28 Min