Used on u-2 aircraft. 3a thread class right-hand 2.200" thread length pan head style 28 thread quantity per inch cadmium screw surface treated unf thread series
Used on spar parts fuselage: orion. 2a thread class right-hand 0.850" thread length fillister head style 0.046" hole diameter 40 thread quantity per inch cadmium screw surface treated unf thread series
Used on 1520-01-106-9519. 3a thread class right-hand dee head style 0.190" hole diameter screw machine-aircraft, pan head, cruiform recess full point is flat unjf thread series