9/16-18X3 GR8 UNF HEX CAP YELLOW ZINC SAE J429 GRADE 8 UNF HEX CAP SCREWS YELLOW ZINC ASME B18.2.1 1996 IFI-7 AF 0.798-0.812” HH 0.348-0.371” AC 0.910-0.938”