1/2-13X4 GR2 HEX CAP SCR PLN FULL TH SAE J429 GRADE 2 HEX CAP SCREWS PLAIN FULL THREAD ASME B18.2.1 1996 IFI-7 AF 0.736-0.750” HH 0.302-0.323” AC 0.840-0.866”