1/4-20X2 1/2 GR5 HEX F/T CAP SCR PLN SAE J429 GRADE 5 HEX CAP SCREWS PLAIN FULL THREAD ASME B18.2.1 1996 IFI-7 AF 0.428-0.438” HH 0.150-0.163” AC 0.488-0.505”