2a stud thread thread class right-hand nut thread 0.500" overall length 32 nut thread thread quantity per inch slot on stud end unc stud thread thread series
3a nut thread thread class right-hand nut thread 0.380" stud thread thread length 1.680" overall length 24 stud thread thread quantity per inch 0.062 in. dia hole, 0.150 in. from center of hole to nut end stepped unf nut thread thread series