Used on cargo truck air brake system. 3a 2nd end thread class 3/8-18 nptf threaded internally on the THREA1E1 external boss end nptf 1st end thread series
Used on grumman a-10 acft; support equipment, b-1 aircraft; truck, fire/crash p12; aircraft, f16; 485l tacs; galaxy c-5; hercules c-130; stratolifter c-135; phantom f-4. 3a 2nd end thread class center wrenching facility; weapon system essential passivate surface treated anpt 1st end thread series