LOCK NUT, FINISH ZINC PLATED, MATERIAL STEEL, MATERIAL GRADE/CLASS GRADE 2, THREAD SIZE 5/8 IN.-11, HEX WIDTH 15/16 IN, HEX HEIGHT 11/64 IN, LOCK TYPE NYLON INSERT, DIMENSIONAL STANDARDS ASME B633 SC1 TYPE III, MS21083, SAE J995, SYSTEM OF MEASUREMENT INCH, HEX TYPE JAM HEX, THREAD DIRECTION RIGHT HAND, INSERT MATERIAL NYLON, MAXIMUM TEMPERATURE 250 DEGREES F, MINIMUM YIELD STRENGTH 45,000 PSI, PACK SIZE BULK PACK