| Displacement | 700t standard, 940t surface |
|---|---|
| Length | 71.5m wl, 75.7m oa |
| Width | 6.7m |
| Draught | 3.95m |
| Machinery | 2-shaft diesel/electric motor, 2900bhp surface, 1200shp submerged |
| Speed | 19kt surface, 8.2kt submerged |
| Armament | 4-53cm TT, 1-8cm/40cal gun, 1-13.2mm AA |
| Complement | 42 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| Ro-33 | FY1931 | Kure NYd | 1933. 8. 8 | 1934.10.10 | 1935.10. 7 | SS2 | 1942. 8.29 sunk (action, off Port Moresby) [09.36S, 147.06E] 1942. 9. 1 missing 1942.10. 5 disc |
| Ro-34 | FY1931 | Mitsubishi, Kobe | 1934. 4.25 | 1935.12.12 | 1937. 5.31 | SS2 | 1943. 4. 6 sunk (action, Central Solomon) [08.15S, 158.55E] 1943. 5. 2 missing 1943. 9.15 disc |