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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| U63 | 247 | Germaniawerft, Kiel | 1915 | 8.2.1916 | 3.1916 | Austrian flag 1916 (U63), to United Kingdom 1.1919 | |
| U64 | 248 | Germaniawerft, Kiel | 1915 | 29.2.1916 | 4.1916 | Austrian flag 1916 (U64), sunk 17.6.1918 | |
| U65 | 249 | Germaniawerft, Kiel | 1915 | 21.3.1916 | 5.1916 | Austrian flag 1916 (U65), scuttled 28.10.1918 |
| Displacement standard, t |
|
|---|---|
| Displacement normal, t | 810 / 927 |
| Length, m | 68.4 |
| Breadth, m | 6.30 |
| Draught, m | 4.04 |
| No of shafts | 2 |
| Machinery | 2 Germania diesels / 2 SSW electric motors |
| Power, h. p. | 2200 / 1200 |
| Max speed, kts | 16.5 / 9 |
| Fuel, t | diesel oil 108 |
| Endurance, nm(kts) | 9170(8) / 60(5) |
| Armament | 1 x 1 - 105/43 TK L/45 C/16, 4 - 500 TT (2 bow, 2 stern, 8) |
| Complement | 36 |
| Diving depth operational, m | 50 |
Medium coastal submarines of Mobilization type, improved U51. Double-hulled.
late 1916, all: + 1 x 1 - 88/27 TK L/30 C/08
mid-1918, all: - 1 x 1 - 88/27
All three since 1916 served in the Mediterranean under Austro-Hungarian flag. U64 was sunk SO of Sardinia 17.6.1918 by Ramming and depth charges of British trawler Partridge II and sloop Lychnis.

