3a thread class right-hand 1.625" thread length hexagon head style 0.547" grip length 24 thread quantity per inch bolt, machine, aircraft ultimate tensile strength at root dia. for steel 6500 pounds unf thread series
Used on c-130j aircraft. 3a thread class right-hand 0.954" thread length double hexagon w/hole head style 0.088" grip length 24 thread quantity per inch unjf thread series