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| Names | Builders | Commissioned | Losses | Transfers | Discarding |
|---|---|---|---|---|---|
PS31 つくば [Tsukuba] |
Hitachi, Kanagawa: PS31 | 3/1962: PS31 |
none |
none |
2/1982: PS31 |
| Displacement standard, t | 63 |
|---|---|
| Displacement full, t | 95 |
| Length, m | 24.5 |
| Breadth, m | 6.50 |
| Draught, m | 1.18 |
| No of shafts | 2 |
| Machinery | 2 Niigata diesels |
| Power, h. p. | 1800 |
| Max speed, kts | 17.3 |
| Fuel, t | diesel oil |
| Endurance, nm(kts) | 230(15) |
| Armament | 1 x 1 - 12.7/90 (may be fitted) |
| Electronic equipment | radar |
| Complement | 19 |
Rated as small patrol vessel.
None.
No significant events.

