Used on w/s:support equipment, b-1 aircraft; communications systems, an/wrr-7; teletype, model 28; los angeles class ssn (688); virginia class submarine, ssn-774; engine, aircraft, f101-ge-102 (b-1); submarine communications and antenna systems; sturgeon class ssn (637); seawolf class ssn. 2b thread class right-hand 48 thread quantity per inch passivate surface treated