7/16-20X3 1/2 GR8 UNF HEX CAP SCR YZ SAE J429 GRADE 8 UNF HEX CAP SCREWS YELLOW ZINC ASME B18.2.1 1996 IFI-7 AF 0.612-0.625” HH 0.272-0.291” AC 0.698-0.722”