| Displacement | 2390t standard, 2934t surface, 4172t submerged |
|---|---|
| Length | 108.4m pp, 112.0m wl, 113.7m oa |
| Width | 9.55m |
| Draught | 5.39m |
| Machinery | 2-shaft diesel and electoric motor, 4700bhp surface, 1200shp submerged |
| Speed | 17.7kt surface, 6.2kt submerged |
| Armament | 6-53cm TT, 1-14cm/40cal gun, 2-25mm AA, 1 aircraft |
| Complement | 114 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-12 | FY1941 | Kawasaki, Kobe | 1942.11. 5 | 1943. 8. 3 | 1944. 5.25 | SS1 | 1945. 1.31 missing (Central Pacific area) 1945. 8.10 disc |