| Displacement | 2231t standard, 2525t surface, 3538t submerged |
|---|---|
| Length | 103.8m pp, 107.0m wl, 109.3m oa |
| Width | 9.1m |
| Draught | 5.26m |
| Machinery | 2-shaft diesel and electoric motor, 11,200bhp surface, 2800shp submerged |
| Speed | 23kt surface, 8kt submerged |
| Armament | 6-53cm TT, 1-14cm/40cal gun, 2-13.2mm AA, 1 aircraft |
| Complement | 100 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-7 | FY1934 | Kure NYd | 1934. 9.12 | 1935. 7. 3 | 1937. 3.31 | SS1 | 1943. 6.22 sunk (action, at Kiska I.) [51.49N, 177.20E] 1943. 8. 1 disc |
| I-8 | FY1934 | Kawasaki, Kobe | 1934.10.11 | 1936. 7.20 | 1938.12. 5 | SS1 | 1945. 3.31 sunk (action, S of Okinawa) [25.29N, 128.35E] 1945. 8.10 disc |