| Lead Boat: SS-188, U.S.S. Sargo |
| Length: 310' 6" |
| Beam: 26' 10" |
| Draft: 16' 7" (Surface trim) |
| Displacement: 1,450 tons (surfaced); 2,350 tons (submerged) |
| Speed: 21 knots (surfaced); 8.75 knots (submerged) |
| Diving Depth: 250' (test depth) |
| Range: 11,000 miles |
| Endurance: |
| Crew: 5 officers, 54 enlisted |
| Deck Gun: 1-3"/50-calibre |
| Anti-Aircraft Weapons: |
| Light Weaponry: |
| Torpedoes: 4-21" torpedo tubes (bow), 4-21" torpedo tubes (stern); 24 torpedoes |
| Engines: 4-1,535 hp main engines, 2-258 kw auxiliaries |
| Motors: 4-685 hp |
| Radar: |
| Sonar: |
| Wartime Modifications: Cut down conning tower, additional guns |
