Used on v1h-1n helicopter. 2a thread class right-hand headless (setscrew) head style 28 thread quantity per inch screw, set-nylon, headless, fine thread unf thread series
3a thread class right-hand headless (setscrew) head style 32 thread quantity per inch 18-8 stainless steel setscrew with nylon soft flat point unc thread series
Used on b-52 aircraft. 3a thread class right-hand 0.188" thread length headless (setscrew) head style 56 thread quantity per inch setscrew passivate surface treated unc thread series
2a thread class right-hand 1.045" thread length square head style 16 thread quantity per inch setscrew, square head, cup point radius of neck relief .041 width of neck relief .125 cadmium or zinc surface treated unc thread series
Used on end item nsn: 1520-01-355-8250; ah-64d helicopter. 3a thread class right-hand 0.127" thread length headless (setscrew) head style 56 thread quantity per inch setscrew, self-locking passivate surface treated unjc thread series