Coupling Nut Reducer Material Steel Material Grade/Class Grade 2 Finish Zinc Plated Thread Size A 3/8 In.-16 Thread Size B 5/16 In.-18 Thread Style Fully Threaded Hex Width 1/2 in Overall Length 1 in System of Measurement Inch Thread Direction Right Hand Minimum Tensile Strength 5 750 psi Pack Size Small Pack Proof Load 90 000 psi Rockwell Hardness C32 Package Quantity 10