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| Name | No | Yard No | Builder | Laid down | Launched | Comp. | Fate |
|---|---|---|---|---|---|---|---|
| Y311 | Sinmalaik DYd | 1967 | in service (2019) | ||||
| Y312 | Sinmalaik DYd | 1969 | foundered 4.5.2008 |
| Displacement standard, t | |
|---|---|
| Displacement full, t | 250 |
| Length, m | 37.0 |
| Breadth, m | 7.30 |
| Draught, m | 1.10 |
| No of shafts | 2 |
| Machinery | 2 MTU-Mercedes-Benz diesels |
| Power, h. p. | 1000 |
| Max speed, kts | 14 |
| Fuel, t | diesel oil |
| Endurance, nm(kts) | |
| Armament | 2 x 1 - 40/60 Mk 3, 4 x 1 - 20/70 Mk 10 |
| Electronic equipment | Raytheon 1500 radar |
| Complement | 37 |
Improved Y301, slightly larger and not having a funnel and carrying both 40mm guns on the main deck. All gunmounts have bulletproof shields.
None.
Y312 was destroyed during tropical cyclone Nargis in May 2008.

