3a thread class right-hand 0.501" thread length flat countersunk head style 0.490" grip length 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.403" thread length flat countersunk head style 0.177" grip length 28 thread quantity per inch passivate surface treated unjf thread series
Used on f-18 e/f. 3a thread class right-hand flush countersunk head style 0.558" grip length 28 thread quantity per inch pin, rivet, fluted threads-shear 100 degree c sunk, hex point drive 0.0156 oversize cres (125 ksi fsu) passivate surface treated unjf thread series
Used on DOOR. right-hand 0.781" thread length hexagon head style 9 thread quantity per inch used on aircraft elevator doors, rope support assembly unc thread series