| Displacement | 690t standard, 850t submerged |
|---|---|
| Length | 61.0m pp |
| Width | 6.5m |
| Draught | 4.1m |
| Machinery | 2-shaft diesel-electric, 1850bhp surface, 1700shp submerged |
| Speed | 12kt surface, 15kt submerged |
| Armament | 3-533mm TT |
| Complement | 43 |
| Number | Name | Plan | Builder | Laid down | Launch | Complete | ||
|---|---|---|---|---|---|---|---|---|
| SS-523 | Natsushio | FY1960 | New MHI, Kobe | 1961.12. 5 | 1962. 9.18 | 1963. 6.29 | Submarine | (Subron1, SDF) 1965. 2. 1 (Subron1, SFlotilla1, SDF) 1978. 3.20 disc |
| SS-524 | Fuyushio | FY1960 | Kawasaki, Kobe | 1961.12. 6 | 1962.12.14 | 1963. 9.17 | Submarine | (Subron1, SDF) 1965. 2. 1 (Subron1, SFlotilla1, SDF) 1979. 3.23 (SFlotilla1, SDF) 1980. 6.10 disc |