3a nut thread thread class right-hand nut thread 0.420" nut thread thread length 1.270" overall length 18 stud thread thread quantity per inch navy special project cadmium surface treated uns stud thread thread series
3a nut thread thread class right-hand nut thread 0.891" nut thread thread length 1.781" overall length 16 stud thread thread quantity per inch both ends drilled 0.109 in. dia, 0.047 in. deep cadmium surface treated unc stud thread thread series