2a nut thread thread class right-hand nut thread 0.469" nut thread thread length 1.188" overall length 20 stud thread thread quantity per inch 0.031 in. by 45.0 deg chamfer on both ends cadmium surface treated unf nut thread thread series
3a nut thread thread class right-hand nut thread 0.500" stud thread thread length 1.625" overall length 16 nut thread thread quantity per inch 45.0 deg chamfer on one end, 0.375in. radius on other end cadmium surface treated unc nut thread thread series