| Displacement | 1660t standard, 1926t surface, 2240t submerged |
|---|---|
| Length | 71.0m pp, 73.5m wl, 74.0m oa |
| Width | 8.9m |
| Draught | 5.05m |
| Machinery | 2-shaft diesel and electoric motor, 1750bhp surface, 1200shp submerged |
| Speed | 13kt surface, 6.5kt submerged |
| Armament | 1-14cm/40cal gun, 2-25mm AA |
| Complement | 60 |
| Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|
| I-373 | FY1944 | Yokosuka NYd | 1944. 8.15 | 1944.11.30 | 1945. 4.14 | SS1 | 1945. 8.13 sunk (torpedoed, East China Sea) [29.02N, 123.53E] 1945. 8.14 missing 1945. 9.15 disc |
| I-374 | FY1944 | Yokosuka NYd | 1944.10.24 | - | - | 1945 BU incompleted | |
| I-375 | FY1944 | Yokosuka NYd | - | - | - | 1945 Cancelled | |
| I-376 | FY1944 | Yokosuka NYd | - | - | - | 1945 Cancelled | |
| I-377 | FY1944 | Yokosuka NYd | - | - | - | 1945 Cancelled | |
| I-378 | FY1944 | Yokosuka NYd | - | - | - | 1945 Cancelled |