Used on deep submergence systems programs (dssp);low atitude navigation & targeting infrared system;ospry class mhc;aircraft, b-2 bomber;arleith burke class ddg. 2a 1st end thread class 20 1st end thread quantity per inch weapon system essential passivate surface treated npt 2nd end thread series
3a all ends thread class 1.750" overall length drilled for lock wire holes around the hex passivate body surface treated male coupling half unf all ends thread series