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The CH-4 class was also known as the CH-7 class since CH-7 was the first unit completed. During the war, all nine units of the class were rearmed with triple-mounted Type 96 25-mm AA guns and fitted with a Type 13 radar.
| Builders and Years Completed: |
Various 1938-39 |
| Displacement: | 291-tons standard. |
| Dimensions: | 184.5' x 18.4' x 7.4' |
| Propulsion: | 2 diesel engines, 2-shafts, 2,600 b.h.p, maximum speed 20 knots |
| Armament: | 2 x 40 mm AA guns, 36 depth charges. |

