The total number of German U-boats is arranged according to the official German design types. For cross-referencing of design types with U-boat hull numbers, see chapter 2.
Oceangoing combat U-boat type of conventional design developed in 1933–34
| Surface/submerged displacement: | 862/983 t |
| Overall length/beam/draught: | 72.39 m/6.21 m/4.30 m |
| Standard main armament: | 6 torpedo tubes (4 bow, 2 stern) with up to 14 torpedoes |