2a nut thread thread class right-hand nut thread 0.469" stud thread thread length 1.406" overall length 18 stud thread thread quantity per inch 0.031 in. by 40 deg min to 50 deg max chamfer at both ends cadmium surface treated unf nut thread thread series
3a thread class right-hand 0.625" thread length hexagon head style 24 thread quantity per inch 4 external slots equally spaced 0.062 in. wide by 0.500 long on shank cadmium surface treated concentric hole unthreaded unf thread series
3a thread class right-hand 0.584" thread length hexagon head style 0.084" grip length 20 thread quantity per inch cadmium or zinc surface treated unf thread series