Used on emf defense meteorological satellite program (dmsp);2320-01-097-0248,2320-01-097-0249,2320-01-100-7672,2320-01-097-0260,2320-01-195-7641 hemtt (heavy expanded mobility tactical trucks). 2a 1st end thread class 16 1st end thread quantity per inch weapon system essential nptf 2nd end thread series