Used on helicopter, carrier based asw, sh-60f; virginia class cgn (41); ticonderoga class cg (47); usns henry j. kaiser class tao; helicopter, search and rescue, hh-60h; sturgeon class ssn (637); computer display set, an/uyq-21(v); missile, air intercept, sidewinder (aim-9); helicopter, uscg search and rescue, hh-60j; los angeles class ssn (688). 2a thread class right-hand 1.276" overall length 32 thread quantity per inch weapon system essential silver spring surface treated unef thread series