1/2-20X4 1/2 GR8 UNF HEX CAP SCR YZ SAE J429 GRADE 8 HEX CAP SCREWS YELLOW ZINC ASME B18.2.1 1996 IFI-7 AF 0.736-0.750” HH 0.302-0.323” AC 0.840-0.866” – 50/BOX