| Displacement | 286t surface, 321t submerged |
|---|---|
| Length | 40.1m pp, 43.3m oa |
| Width | 4.1m |
| Draught | 3.4m |
| Machinery | 2-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-7 (SS-16) | FY1915 | Kure NYd | 1916. 1. 8 | 1916. 3.15 | 1916.11. 1 | SB2 (SS-16) | 1919. 4. 1 SS3 1923. 6.15 renamed(Ha-7) 1929.12. 1 disc |
| Ha-8 (SS-17) | FY1915 | Kure NYd | 1916. 1. 8 | 1916. 3.15 | 1917. 2. 2 | SB2 (SS-17) | 1919. 4. 1 SS3 1923. 6.15 renamed(Ha-8) 1929.12. 1 disc |