Used on c-5 aircraft. 3a thread class right-hand 0.528" thread length hexagon head style 0.625" grip length 20 thread quantity per inch bolt, shear cadmium surface treated unjf thread series
Used on end item nsn: 3810-01-553-7771. right-hand 1.000" thread length hexagon head style 16 thread quantity per inch zinc surface treated unc thread series