| Displacement | 988t standard, 996t surface, 1322t submerged |
|---|---|
| Length | 74.07m pp, 76.20m oa |
| Width | 7.38m |
| Draught | 3.77m |
| Machinery | 2-shaft diesel/electric motor, 2400bhp surface, 1600shp submerged |
| Speed | 16.5kt surface, 9kt submerged |
| Armament | 6-53cm TT, 1-8cm/40cal AA gun, 1 MG |
| Complement | 47 - 60 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ro-60 (SS-59) | FY1918 | Mitsubishi, Kobe | 1921.12. 5 | 1922.12.22 | 1923. 9.17 | SS2 (SS-59) | 1924.11. 1 renamed (Ro-60) 1941.12.31 lost (wrecked, Kwajalin) [09N, 167.30E] 1942. 1.10 disc |
| Ro-61 (SS-72) | FY1923 | Mitsubishi, Kobe | 1922. 6. 5 | 1923. 5.19 | 1924. 2. 9 | SS2 (SS-72) | 1924.11. 1 renamed(˜C61) 1942. 9. 1 sunk (action, Atoka I.) [52.36N, 173.57W] 1942. 9. 1 missing 1942.10.20 disc |
| Ro-62 (SS-73) | FY1923 | Mitsubishi, Kobe | 1922. 9. 8 | 1923. 9.19 | 1924. 7.24 | SS2 (SS-73) | 1924.11. 1 renamed (Ro-62) 1945.11.20 disc 1946 BU |
| Ro-63 (SS-84) | FY1923 | Mitsubishi, Kobe | 1923. 4. 2 | 1924. 1.24 | 1924.12.20 | SS2 | 1945.11.20 disc 1946 BU |
| Ro-64 | FY1923 | Mitsubishi, Kobe | 1923.10.15 | 1924. 8.19 | 1925. 4.30 | SS2 | 1945. 4.12 sunk (mined, Hiroshima bay) [34.14N, 132.16E] 1945. 8.10 disc |
| Ro-65 | FY1923 | Mitsubishi, Kobe | 1924.11.15 | 1925. 9.25 | 1926. 6.30 | SS2 | 1942.11. 4 lost (accident, Kiska I.) [51.58N, 177.33E] 1943. 8. 1 disc |
| Ro-66 | FY1923 | Mitsubishi, Kobe | 1925.12. 1 | 1926.10.25 | 1927. 7.28 | SS2 | 1941.12.17 lost (collision with Ro-62, near Wake I.) [19.10N, 166.28E] 1942. 1.15 disc |
| Ro-67 | FY1923 | Mitsubishi, Kobe | 1925. 3. 5 | 1926. 3.18 | 1926.12.15 | SS2 | 1945. 7.20 disc 1946 BU |
| Ro-68 | FY1923 | Mitsubishi, Kobe | 1924. 2. 6 | 1925. 2.23 | 1925.10.29 | SS2 | 1945.11.30 disc 1946 BU |