5/16-24X2 GR8 UNF HEX CAP SCR YZ SAE J429 GRADE 8 UNF HEX CAP SCREWS YELLOW ZINC ASME B18.2.1 1996 IFI-7 AF 0.489-0.500” HH 0.195-0.211” AC 0.557-0.577”