Used on aircraft orion p-3. 3a thread class right-hand 0.267" thread length flat countersunk head style 0.302" grip length 24 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.080" thread length flat chamfer head style 40 thread quantity per inch navy special project passivate surface treated unc thread series
3a thread class left-hand 0.750" thread length fillister head style 0.047" hole diameter 32 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.875" thread length hexagon head style 0.375" grip length 20 thread quantity per inch zinc surface treated unc thread series
3a thread class right-hand 0.330" thread length hexagon head style 0.070" hole diameter 24 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.200" thread length flat chamfer head style 40 thread quantity per inch navy special project passivate surface treated unc thread series