3a thread class right-hand 1.125" thread length flat chamfer head style 0.044" hole diameter 18 thread quantity per inch passivate surface treated unrc thread series
2a thread class right-hand 1.250" thread length flat countersunk head style 24 thread quantity per inch passivate screw surface treated unf thread series
Used on RQ-4A. 3a thread class right-hand 0.370" thread length flat countersunk head style 0.302" grip length 28 thread quantity per inch bolt, 100 deg head, cruciform recess, close tolerance, A2 passivate surface treated unf thread series