| Submarine | Comm | LOA (ft) | Beam (ft) | Std. Disp. (tons) | Submerged Disp. (tons) | Shafts | Armor | Surface Speed kts | Submerged Speed kts | Guns |
| SS-167 Narwhal | Dec 1927 | 371 | 33.25 | 2987 | 3960 | 2 | 0 | 17.44 | 8 | 2-6" (2x1), 6-TT (4 Bow, 2 Stern) |
| SS-168 Nautilus | Mar 1930 | |||||||||
| LOA (inches) | Beam (inches) | Std. Disp. (lbs) | Full Load (lbs) | Bilge Pump | Armor | Speed 100' | Speed 100' | Guns | ||
| 46.38 | 4.16 | 7.6 | 10.0 | 1/2 | 1/32" | 65.3 | 142.4 | 2-BB, 6-TT |