2a stud thread thread class right-hand nut thread 0.500" nut thread thread length 1.188" overall length 20 stud thread thread quantity per inch 0.226 in. dia of unthreaded portion unc stud thread thread series
3a nut thread thread class right-hand nut thread 0.980" nut thread thread length 1.840" overall length 14 stud thread thread quantity per inch first two stud end thds have pitch dia of 0.3916-0.3936 cadmium surface treated unf nut thread thread series
3a nut thread thread class right-hand nut thread 0.980" thread length 1.840" overall length 14 stud thread thread quantity per inch first two stud end thds have pitch dia. of 0.3956-0.3976 cadmium surface treated unc stud thread thread series