2a nut thread thread class right-hand nut thread 0.360" stud thread thread length 2.570" overall length 24 nut thread thread quantity per inch nut end flatted 0.250 in. lg 0.250 in. thk cadmium surface treated unf nut thread thread series
3a nut thread thread class right-hand nut thread 0.500" stud thread thread length 1.250" overall length 18 stud thread thread quantity per inch milled thread or equivalent on stud end only cadmium surface treated unf nut thread thread series