3a nut thread thread class right-hand nut thread 0.562" nut thread thread length 12 nut thread thread quantity per inch hole in head 0.562 in. dia. in center of head welding unf nut thread thread series
2a stud thread thread class right-hand stud thread 0.625" stud thread thread length 24 stud thread thread quantity per inch navy special project welding unf stud thread thread series
3a nut thread thread class right-hand nut thread 0.875" nut thread thread length 20 nut thread thread quantity per inch unthreaded end flatted one side cadmium surface treated welding unf nut thread thread series