| Displacement | 1420t standard, 1810t surface, 2564t submerged |
|---|---|
| Length | 98.4m pp, 102.6m wl, 105.0m oa |
| Width | 8.2m |
| Draught | 4.60m |
| Machinery | 2-shaft diesel and electoric motor, 9000bhp surface, 1800shp submerged |
| Speed | 23kt surface, 8kt submerged |
| Armament | 6-53cm TT, 1-12cm/45cal gun, 4-13.2mm MG |
| Complement | 60 - 84 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-74 (I-174) | FY1934 | Sasebo NYd | 1934.10.16 | 1937. 3.28 | 1938. 8.15 | SS1 | 1942. 5.20 renamed (I-174) 1944. 4.12 sunk (air attack, off Truk) 1944. 4.13 missing 1944. 6.10 disc |
| I-75 (I-175) | FY1934 | Mitsubishi, Kobe | 1934.11. 1 | 1937. 9.16 | 1938.12. 8 | SS1 | 1942. 5.20 renamed (I-175) 1944. 2. 4 sunk (air attack, off Jaluit I.) [06.48N, 168.08E] 1944. 3.26 missing 1944. 7.10 disc |