Used on valve assy. & dets-globe. 2a thread class right-hand 0.138" thread length pan no. 2 head style 32 thread quantity per inch 50 valve size unc thread series
3a thread class right-hand 0.641" thread length flat countersunk head style 0.500" grip length 24 thread quantity per inch passivate surface treated unjf thread series
Used on flight controls, fus. forward section froe and aft controls, sta. 50. 3a thread class right-hand 0.812" thread length hexagon head style 28 thread quantity per inch unf thread series