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