| Displacement | 897t surface, 1195t submerged |
|---|---|
| Length | 76.2m oa |
| Width | 7.2m |
| Draught | 4.0m |
| Machinery | 2-shaft diesel/electric motor, 2400bhp surface, 1600shp submerged |
| Fuel | oil 98t |
| Speed | 17kt surface, 8kt submerged |
| Range | 7000nm by 10kt surface, 85nm by 4kt submerged |
| Armament | 6-45cm TT, 1-8cm/28cal AA gun, 1-7.7mm MG |
| Complement | 48 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ro-57 (SS-46) | FY1918 | Mitsubishi, Kobe | 1920.11.20 | 1921.12. 3 | 1922. 7.30 | SS2 (SS-46) | 1924.11. 1 renamed(Ro-57) 1945.11.20 disc |
| Ro-58 (SS-47) | FY1918 | Mitsubishi, Kobe | 1921. 2.15 | 1922. 3. 2 | 1922.11.25 | SS2 (SS-47) | 1924.11. 1 renamed(Ro-58) 1945. 9.15 disc |
| Ro-59 (SS-57) | FY1918 | Mitsubishi, Kobe | 1921. 5.18 | 1922. 6.28 | 1923. 3.20 | SS2 (SS-57) | 1924.11. 1 renamed(Ro-59) 1945.11.20 disc |