Used on airborn mobile dir air spt ctl (2id), (02m jul83) an/uyq-3a. radio transmitter set, an/urt-23 (rts). model 28 teletype. spruance class dd (963), los angeles class ssn (688), forrestal class cv, ticonderoga class cg (47), sturgoen class ssn (637), virginia class cgn (41).. 2a thread class right-hand 0.750" overall length weapon system essential unf thread series