She is an enlarged version of Kamome class sub-chaser.
| Standard Displacement | 442t (PC 309/310)
460t (PC 317/318) |
| Length | 60.00m |
| Beam | 7.10m |
| Draught | 2.33m (PC 309/310)
2.40m (PC 317/318) |
| Machine Type | 2 Mitsui-B&W 635VBU-45 Supercharged Diesel |
| Output | 4000PS |
| Number of shaft | 2 |
| Speed | 20.4kt |
| Crew | 70 (PC 309/310)
83 (PC 317/318) |
| Guns | 1 Mk 1 40mm(II) |
| AS Weapons | 1 Type 54/Mk 10 Hedgehog Launcher
1 Type 54 Depth Charge Rack 2 Mk 2 Torpedoe Launcher (PC 309/310) 2 Type 68/Mk 32 Torpedoe Launcher (III) (PC 317/318) |
| Electronic Equipment | 1 OPS-16 SS Radar
1 Mk 4 FC Radar 1 Mk 63 GFCS 1 SQS-11A Sonar 1 OLR-4B ESM (PC 309/310) 1 NOLR-1 ESM (PC 317/318) |
| Name | Laid Down | Launched | Completed | Deleted |
| PC 309 Umitaka | 1959/03/13 | 1959/07/25 | 1959/11/30 | 1980/03/17 (ASU86)
1984/03/10 |
| PC 310 Ootaka | 1959/03/18 | 1959/09/03 | 1960/01/14 | 1981/03/27 (ASU88)
1985/02/20 |
| PC 317 Wakataka | 1962/03/05 | 1962/11/13 | 1963/03/30 | 1985/03/27 (ASU 64)
1988/03/17 |
| PC 318 Kumataka | 1962/03/20 | 1962/10/21 | 1963/03/25 | 1985/03/27 (ASU 65)
1989/03/24 |