2a nut thread thread class right-hand nut thread 0.313" nut thread thread length 1.363" overall length 18 stud thread thread quantity per inch stud, ring-locked, 4130 steel, fine thread nut end, coarse thread stud end; drilled; magnesium is intended substrare nut thread to mil-s-8879; stud end thread has a special pitch diameter which mates with a national class 3 taped hole cadmium surface treated locked in unc stud thread thread series
3a nut thread thread class right-hand nut thread 0.505" stud thread thread length 1.547" overall length 14 stud thread thread quantity per inch navy special project locked in unc stud thread thread series
Used on f-101 engine. 3a nut thread thread class right-hand nut thread 0.472" stud thread thread length 1.548" overall length 20 stud thread thread quantity per inch locked in unjf nut thread thread series