| Displacement | 2140t standard, 2607t surface, 3688t submerged |
|---|---|
| Length | 102.4m pp, 106.9m wl, 108.7m oa |
| Width | 9.3m |
| Draught | 5.19m |
| Machinery | 2-shaft diesel and electoric motor, 4700bhp surface, 1200shp submerged |
| Speed | 17.7kt surface, 6.5kt submerged |
| Armament | 6-53cm TT, 1-14cm/40cal gun, 2-25mm AA, 1 aircraft |
| Complement | 101 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-54 | FY1942 | Yokosuka NYd | 1942. 7. 1 | 1943. 5. 4 | 1944. 3.31 | SS1 | 1944.10.28 sunk (action, E of Leyte) [09.45N, 126.45E] 1944.11.20 missing 1945. 3.10 disc |
| I-56 | FY1942 | Yokosuka NYd | 1942. 9.29 | 1943. 6.30 | 1944. 6. 8 | SS1 | 1945. 4. 5 sunk (action, off Kume I.) [26.42N, 130.38E] 1945. 5. 2 missing 1945. 6.10 disc |
| I-58 | FY1942 | Yokosuka NYd | 1942.12.26 | 1943.10. 9 | 1944. 9. 7 | SS1 | 1945.11.30 disc 1946. 4. 1 scuttled |
| I-62 | FY1943 | Yokosuka NYd | - | - | - | 1943 cancelled | |
| I-64 | FY1943 | Yokosuka NYd | - | - | - | 1943 cancelled | |
| I-65 | FY1943 | Yokosuka NYd | - | - | - | 1943 cancelled | |
| I-66 | FY1943 | Yokosuka NYd | - | - | - | 1943 cancelled |