Used on w/s:an/srn-25(v) navigation radio set; helicopter, mh-53e; aircraft, airlifter c-17a; teletype, model 28; helicopeter, carrier based asw, sh-60f; wasp class lhd; nimitz class cvn; tarawa class lha; whidbey island class lsd; a/a42r-1 refueling system. 2b thread class right-hand 32 thread quantity per inch passivate surface treated