| Displacement | 2434t standard, 2919t surface, 4149t submerged |
|---|---|
| Length | 108.4m pp, 112.0m wl, 113.7m oa |
| Width | 9.55m |
| Draught | 5.36m |
| Machinery | 2-shaft diesel and electoric motor, 12,400bhp surface, 2400shp submerged |
| Speed | 23.5kt surface, 8kt submerged |
| Armament | 6-53cm TT, 1-14cm/40cal gun, 2-25mm AA, 1 aircraft |
| Complement | 114 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-9 | FY1937 | Kure NYd | 1938. 1.25 | 1939. 5.20 | 1941. 2.13 | SS1 | 1943. 6.13 sunk (action, near Kiska) [52.08N, 177.38E] 1943. 6.15 missing 1943. 8. 1 disc |
| I-10 | FY1937 | Kawasaki, Kobe | 1938. 6. 7 | 1939. 9.20 | 1941.10.31 | SS1 | 1944. 7. 2 missing 1944. 7. 4 sunk (action, near Saipan) [15.26N, 147.48E] 1944.10.10 disc |
| I-11 | FY1939 | Kawasaki, Kobe | 1940. 4.10 | 1941. 2.28 | 1942. 5.16 | SS1 | 1944. 3.20 missing (Elis Is. area) 1944. 4.30 disc |