| Displacement | 2198t standard, 2589t surface, 3654t submerged |
|---|---|
| Length | 102.4m pp, 106.9m wl, 108.7m oa |
| Width | 9.3m |
| Draught | 5.14m |
| Machinery | 2-shaft diesel/electric motor, 12,400bhp surface 2000shp submerged |
| Speed | 23.6kt 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-15 | FY1937 | Kure NYd | 1938. 1.25 | 1939. 3. 7 | 1940. 9.30 | SS1 | 1942.12. 5 missing (near Guadalcanal) [10.53S, 161.50E] 1942.12.24 disc |
| I-17 | FY1937 | Yokosuka NYd | 1938. 4.18 | 1939. 7.19 | 1941. 1.24 | SS1 | 1943. 8.19 sunk (action, off Numea) [23.26S, 166.50E] 1943.10.24 missing 1943.12. 1 disc |
| I-19 | FY1937 | Mitsubishi, Kobe | 1938. 3.15 | 1939. 9.16 | 1941. 4.28 | SS1 | 1943.11.25 sunk (action, off Makin) [03.10N, 171.55E] 1944. 2. 2 missing 1944. 4.30 disc |
| I-21 | FY1937 | Kawasaki, Kobe | 1939. 1. 7 | 1940. 2.24 | 1941. 7.15 | SS1 | 1943.11.29 sunk (air attack, near Gilbert Is.) 1943.12.24 missing 1944. 4.30 disc |
| I-23 | FY1937 | Yokosuka NYd | 1938. 1.28 | 1939.11.24 | 1941. 9.27 | SS1 | 1942. 2.28 missing (near Hawaii) 1942. 4.30 disc |
| I-25 | FY1937 | Mitsubishi, Kobe | 1939. 2. 3 | 1940. 6. 8 | 1941.10.15 | SS1 | 1943. 9. 3 sunk (action, off New Hebrides) 1943.10.24 missing 1943.12. 1 disc |
| I-26 | FY1939 | Kure NYd | 1939. 6. 7 | 1940. 4.10 | 1941.11. 6 | SS1 | 1944.10.25 sunk (action, E of Leyte) [10.56N, 127.13E] 1944.11.21 missing 1945. 3.10 disc |
| I-27 | FY1939 | Sasebo NYd | 1939. 7. 5 | 1940. 6. 6 | 1942. 2.24 | SS1 | 1944. 2.13 sunk (action, SW of Maldiv) 1944. 7.10 disc |
| I-28 | FY1939 | Mitsubishi, Kobe | 1939. 9.25 | 1940.12.18 | 1942. 2. 6 | SS1 | 1942. 5.16 missing 1942. 5.17 sunk (torpedoed, S of Truk) [06.30N, 152E] 1942. 6.15 disc |
| I-29 | FY1939 | Yokosuka NYd | 1939. 9.20 | 1940. 9.29 | 1942. 2.27 | SS1 | 1944. 7.26 sunk (torpedoed, Bashi Strait) [20.10N, 121.55E] 1944.10.10 disc |
| I-30 | FY1939 | Kure NYd | 1939. 6. 7 | 1940. 9.17 | 1942. 2.28 | SS1 | 1943.10.13 sunk (torpedoed, off Singapore) 1944. 4.15 disc |
| I-31 | FY1939 | Yokosuka NYd | 1939.12. 6 | 1941. 3.13 | 1942. 5.30 | SS1 | 1943. 5.13 sunk (action, off Attu) 1943. 5.14 missing 1943. 8. 1 disc |
| I-32 | FY1939 | Sasebo NYd | 1940. 1.20 | 1940.12.17 | 1942. 4.26 | SS1 | 1944. 3.24 sunk (action, off Wodse) [08.30N, 170.10E] 1944. 3.24 missing 1944. 6.10 disc |
| I-33 | FY1939 | Mitsubishi, Kobe | 1940. 2.21 | 1941. 5. 1 | 1942. 6.10 | SS1 | 1944. 6.13 lost (accident, Iyo-nada) [33.40N, 132.30E] 1944. 8.10 disc |
| I-34 | FY1939 | Sasebo NYd | 1941. 1. 9 | 1941. 9.24 | 1942. 8.31 | SS1 | 1943.11.13 sunk (torpedoed, off Penan) [05.26N, 100.06E] 1944. 1. 5 disc |
| I-35 | FY1939 | Mitsubishi, Kobe | 1940. 9. 2 | 1941. 9.24 | 1942. 8.31 | SS1 | 1943.11.22 sunk (action, S of Tarawa) [01.22N, 172.47E] 1944. 1.10 missing 1944. 4.30 disc |
| I-36 | FY1939 | Yokosuka NYd | 1940.12. 4 | 1941.11. 1 | 1942. 9.30 | SS1 | 1945.11.30 disc 1946. 4. 1 scuttled |
| I-37 | FY1939 | Kure NYd | 1940.12. 7 | 1941.10.22 | 1943. 3.10 | SS1 | 1944.11.19 sunk (action, N of Palau) [08.07N, 134.16E] 1944.12. 6 missing 1945. 3.10 disc |
| I-38 | FY1939 | Sasebo NYd | 1941. 6.19 | 1942. 4.15 | 1943. 1.31 | SS1 | 1944.11.12 sunk (action, S of Yap) [08.04N, 138.92E] 1944.12. 6 missing 1945. 3.10 disc |
| I-39 | FY1939 | Sasebo NYd | 1941. 6.19 | 1942. 4.15 | 1943. 4.22 | SS1 | 1943.11.26 sunk (action, W of Makin) 1944. 2.20 missing 1944. 4.30 disc |