3a nut thread thread class right-hand nut thread 0.375" stud thread thread length 4.2500" overall length 20 nut thread thread quantity per inch stud end drilled for cotter pin, 0.106 in. dia. 0.125 in. from end cadmium surface treated shouldered unf nut thread thread series
2a nut thread thread class right-hand nut thread 0.250" stud thread thread length 32 nut thread thread quantity per inch thread on both ends under cut to root dia, 1/32 in. lg oxide surface treated shouldered unc nut thread thread series
Used on tf-33 aircraft engine. matl steel, AMS6322; hardenss rc 35.0-40.0; nickel cadmium plate, AMS2416; modified per pwa-s-2416, fs; length 11.835-11.837; 0.496-0.497 in. dia. 5 lands; 0.410-0.420 in. dia. 4 grooves; threaded 0.500-20 unf-03a both ends; used on the compressor rotor-front