3a 1st end thread class first end nom thd size 0.500 in. nom; second end nom thd size 0.562 in. nom anodize inside surface treated anpt 2nd end thread series
Used on iwo jima class lph; air compressor, high pressure; poseidon material (hull,mech,elec,ord,electronics). 3a 1st end thread class 12 1st end thread quantity per inch material brass; do not dupe to p/n 4-202142-3/4-16 (monel) per navy requirements npt 2nd end thread series
