| Displacement | 2620t standard, 3603t surface, 4762t submerged |
|---|---|
| Length | 108.4m pp, 113.7m oa |
| Width | 11.7m |
| Draught | 5.89m |
| Machinery | 2-shaft diesel and electoric motor, 4400bh surfacep, 600shp submerged |
| Speed | 16.7kt surface, 5.5kt submerged |
| Armament | 6-53cm TT, 1-14cm/40cal gun, 7-25mm AA, 2 aircraft |
| Complement | –ñ114 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-13 | FY1943 | Kawasaki, Kobe | 1943. 2. 4 | 1943.11.30 | 1944.12.16 | SS1 | 1945. 8. 1 missing (Truk area) [34.28N, 150.55E] 1945. 9.15 disc |
| I-14 | FY1943 | Kawasaki, Kobe | 1943. 5.18 | 1944. 3.14 | 1945. 3.14 | SS1 | 1945. 9.15 disc 1946. 5.28 scuttled |
| I-15 | FY1943 | Kawasaki, Kobe | 1943. 4.30 | 1944. 4.12 | - | 1945 BU incompleted | |
| I-1 | FY1943 | Kawasaki, Kobe | 1943. 6.24 | 1944. 6.10 | - | 1945. 9.18 lost incomplete refloat, 1947 BU |