| Displacement | 1635t standard, 1720t surface, 2300t submerged |
|---|---|
| Length | 91.0m pp, 95.5m wl, 97.7m oa |
| Width | 7.8m |
| Draught | 4.83m |
| Machinery | 2-shaft diesel/electric motor, 6000bhp surface, 1800shp submerged |
| Speed | 20kt surface, 8.5kt submerged |
| Armament | 6-53cm TT, 1-12cm/45cal gun |
| Complement | 58 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-61 | FY1923 | Mitsubishi, Kobe | 1926.11.15 | 1927.11.12 | 1929. 4. 6 | SS1 | 1941.10. 6 lost (collision with Commerceman, Iki Strait) [33.40N, 129.40E] 1942. 4. 1 disc |
| I-62 (I-162) | FY1923 | Mitsubishi, Kobe | 1927. 4.20 | 1928.11.29 | 1930. 4.24 | SS1 | 1942. 5.20 renamed (I-162) 1945.11.30 disc 1946. 4. 1 scuttled |
| I-64 (I-164) | FY1923 | Kure NYd | 1927. 3.28 | 1929.10. 5 | 1930. 8.30 | SS1 | 1942. 5.17 sunk (torpedoed, off Point Ashizuri) [29.25N, 134.09E] 1942. 5.20 renamed (I-164) 1942. 5.25 missing 1942. 7.14 disc |