| Displacement | 2230t standard, 2624t surface, 3700t submerged |
|---|---|
| Length | 102.4m pp, 106.9m wl, 108.7m oa |
| Width | 9.3m |
| Draught | 5.20m |
| Machinery | 2-shaft diesel and electoric motor, 11,000bhp surface, 2000shp submerged |
| Speed | 23.5kt surface, 8kt submerged |
| Armament | 6-53cm TT, 1-14cm/40cal gun, 2-25mm AA, 1 aircraft |
| Complement | 101 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-40 | FY1941 | Kure NYd | 1942. 3.18 | 1942.11.10 | 1943. 7.31 | SS1 | 1944. 2.21 missing (Gilbert Is. area) 1944. 4.30 disc |
| I-41 | FY1941 | Kure NYd | 1942. 3.18 | 1942.11.10 | 1943. 9.18 | SS1 | 1944.11.18 sunk (action, E of Philippines) [12.44N, 130.42E] 1944.12. 2 missing 1945. 3.10 disc |
| I-42 | FY1941 | Kure NYd | 1942. 3.18 | 1942.11.10 | 1943.11. 3 | SS1 | 1944. 3.23 sunk (torpedoed, SW of Angaur I.) [06.40N, 130.42E] 1944. 4.27 missing 1944. 4.30 disc |
| I-43 | FY1941 | Sasebo NYd | 1942. 4.27 | 1942.10.25 | 1943.11. 5 | SS1 | 1944. 2.15 sunk (torpedoed, N of Truk) [12.42N, 149.10E] 1944. 4. 8 missing 1944. 4.30 disc |
| I-44 | FY1941 | Yokosuka NYd | 1942. 6.11 | 1943. 3. 5 | 1944. 1.31 | SS1 | 1945. 4.17 sunk (action, Okinawa area) [23.12N, 132.23E] 1945. 5. 2 missing 1945. 6.10 disc |
| I-45 | FY1941 | Sasebo NYd | 1942. 7.15 | 1943. 3. 6 | 1943.12.28 | SS1 | 1944.10.28 sunk (action, E of Leyte I.) [10.10N, 127.28E] 1944.12. 2 missing 1945. 3.10 disc |