3a thread class right-hand 0.640" thread length hexagon head style 4.938" grip length 24 thread quantity per inch passivate surface treated unf thread series
Used on c-17 arcft. 3a thread class right-hand 0.363" thread length flat countersunk head style 1.610" grip length 32 thread quantity per inch screw, close tolerance unjf thread series
3a thread class right-hand 0.339" thread length flat countersunk head style 20 thread quantity per inch 82deg flat head screw cadmium surface treated unc thread series