Used on lw/s:aircraft, prowler ea-6b; ticonderoga class cg (47); aircraft, hawkeye e-2c; engine, marine gas turbine lm-2500; oliver perry class ffg; kidd class ddg; spruance class dd (963); fms-build frigates class ships. 3a thread class right-hand 0.500" thread length headless (setscrew) head style 28 thread quantity per inch passivate surface treated unf thread series