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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| Keihässalmi | 05 | Valmet, Helsinki | 1956 | 16.3.1957 | 1958 | stricken 1992 |
| Displacement standard, t | 290 |
|---|---|
| Displacement full, t | 360 |
| Length, m | 56.0 |
| Breadth, m | 7.70 |
| Draught, m | 2.00 |
| No of shafts | 2 |
| Machinery | 2 Wärtsilä diesels |
| Power, h. p. | 1600 |
| Max speed, kts | 15 |
| Fuel, t | diesel oil |
| Endurance, nm(kts) | |
| Armament | 2 x 1 - 40/70 Bofors 315, 2 x 1 - 20/70 Mk 7, 100 mines |
| Electronic equipment | Decca nav. radar |
| Complement | 60 |
Improved Ruotsinsalmi.
1972: - 2 x 1 - 40/70; + 2 x 2 - 30/71 AK-230, Rys' radar
No significant events.

