| Displacement | 286t surface, 321t submerged |
|---|---|
| Length | 40.1m pp, 43.3m oa |
| Width | 4.1m |
| Draught | 3.4m |
| Machinery | 1-shaft diesel/electric motor, 600bhp surface, 300shp submerged |
| Fuel | oil 15t |
| Speed | 12kt surface, 8.5kt submerged |
| Range | 660nm by 12kt surface, 60nm by 4kt submerged |
| Armament | 2-45cm TT, 1 MG |
| Complement | 26 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ha-1 (SS-8) | FY1904 | UK Vickers | 1907. 8. 3 | 1908. 5.19 | 1909. 2.26 | SB (SS-8) | 1916. 8. 4 SB2 1919. 4. 1 SS3 1923. 6.15 renamed(Ha-1) 1924. 4. 1 disc |
| Ha-2 (SS-9) | FY1904 | UK Vickers | 1907. 8. 3 | 1908. 5.19 | 1909. 3. 9 | SB (SS-9) | 1916. 8. 4 SB2 1919. 4. 1 SS3 1923. 6.15 renamed(Ha-2) 1924. 4. 1 disc |