Used on 0wasp class lhd; yellostone class ad-41; general purpose electronic test equipment gpete; aircraft, eagle f-15; forrestal class cv; spruance class dd (963); ticonderoga class cg (47); over the horizon bck scanner (oth-b) program (an/fps-118). 2a thread class right-hand 0.813" overall length 24 thread quantity per inch weapon system essential unef thread series