| Displacement | 57t surface (SS-7 78t), 63t submerged (SS-7 95t) |
|---|---|
| Length | 22.5m oa (SS-7 25.5m) |
| Width | 2.1m (SS-7 2.4m) |
| Draught | 2.0m (SS-7 2.3m) |
| Machinery | 1-shaft gasoline/electric motor, 300bhp surface, 22shp submerged |
| Fuel | gasoline 1.4t (SS-7 1.7t) |
| Speed | 8.5kt surface, 4kt submerged |
| Range | 184nm by 8kt surface, 12nm by 4kt submerged |
| Armament | 1-45cm TT |
| Complement | 16 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| SS-6 | FY1904 | Kawasaki, Kobe | 1904.11.24 | 1905. 9.28 | 1906. 3.30 | SB | 1916. 8. 4 SB2 1919. 4. 1 SS3 1920.12. 1 disc |
| SS-7 | FY1904 | Kawasaki, Kobe | 1904.11.26 | 1905. 9.28 | 1906. 3.30 | SB | 1916. 8. 4 SB2 1919. 4. 1 SS3 1920.12. 1 disc |