| Displacement | 304t surface, 340t submerged |
|---|---|
| Length | 38.1m pp, 38.6m oa |
| Width | 3.8m |
| Draught | 3.1m |
| Machinery | 1-shaft gasoline/electric motor, 1000bhp surface, 300shp submerged |
| Fuel | gasoline 17.8t |
| Speed | 10.8kt surface, 8kt submerged |
| Armament | 2-45cm TT |
| Complement | 26 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ha-6 (SS-13) | FY1904 | Kawasaki, Kobe | 1910. 3.22 | 1912. 7.18 | 1912. 9.30 | SB (SS-13) | 1916. 8. 4 SB2 1919. 4. 1 SS3 1923. 6.15 renamed(Ha-6) 1929.12. 1 disc |