| Lead Boat: SS-417, U.S.S. Tench |
| Length: 312' |
| Beam: 27' |
| Draft: 16' 5" (Surface trim) |
| Displacement: 1,570 tons (surfaced); 2,414 tons (submerged) |
| Speed: 20 knots (surfaced); 9 knots (submerged) |
| Diving Depth: 400' (test depth) |
| Range: 11,000 miles |
| Endurance: |
| Crew: 10 officers, 71 enlisted |
| Deck Gun: 1 or 2-5"/25-calibre |
| Anti-Aircraft Weapons: 2-40mm |
| Light Weaponry: 2 to 6 .50-calibre heavy machineguns |
| Torpedoes: 6-21" torpedo tubes (bow); 4-21" torpedo tubes (stern); 24 torpedoes |
| Engines: 4-GM-Winton V-16, or 4-Fairbanks-Morse 10-cylinder opposed diesels |
| Motors: 2-2,700 hp direct drive DC variable speed |
| Radar: SD/SK air search radar, SJ surface search, ST periscope radar |
| Sonar: JP hydrophones, JK/QC, QB sonar |
| Wartime Modifications: Little or none. Many underwent extensive modification post-war, including GUPPY conversions. |
