Used on aircraft, eagle f-15. 3a thread class right-hand 0.756" thread length oval countersunk head style 0.678" grip length 20 thread quantity per inch unjf thread series
3a thread class right-hand 0.382" thread length flat countersunk head style 1.052" grip length 32 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.381" thread length flat countersunk head style 0.928" grip length 32 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.282" thread length dished hexagon head style 7.500" grip length 28 thread quantity per inch locking element on shank cadmium surface treated unjf thread series