Used on apache attack helicopter. 3a thread class right-hand 0.323" thread length pan head style 0.125" grip length 32 thread quantity per inch bolt, pan head, close tolerance cruciform recess; self locking andnon locking; unplated passivate surface treated unjc thread series
Used on nsn: 2320-01-530-3843. right-hand hexagon head style screw, self-drilling, self-tapping part shall meet the requirements of sae J78-1979 number 10 screw type bsd pan head zinc surface treated