CH-4-class submarine chaser

	No.8 in 1938
Class overview
Name	No.4 class submarine chaser
Builders	Tsurumi Iron Works (3); Mitsubishi Heavy Industries (2); Ōsaka Iron Works, (2); Tama Shipyards, (2);
Operators	Imperial Japanese Navy; Republic of China Navy;
Preceded by	No.3 class
Succeeded by	No.13 class
Cost	1,579,000 JPY
Built	1937 – 1939
In commission	1938 – 1960
Planned	9
Completed	9
Lost	7 (or 6)
Retired	2 (or 3)
General characteristics
Type	Submarine chaser
Displacement	291 long tons (296 t) standard; 309 long tons (314 t) trial;
Length	56.2 m (184 ft 5 in) overall; 55.5 m (182 ft 1 in) waterline;
Beam	5.6 m (18 ft 4 in)
Draught	2.1 m (6 ft 11 in)
Propulsion	2 × Kampon Mk.22 Model 6 diesels, 2 shafts, 2,600 bhp
Speed	20.0 knots (23.0 mph; 37.0 km/h)
Range	2,000 nmi (3,700 km) at 14 kn (16 mph; 26 km/h)
Complement	59
Armament	2 × 40 mm heavy machine guns; 36 × depth charges; 2 × Type 94 depth charge projectors; 1 × depth charge thrower; 1 × Type 93 active sonar; 1 × Type 93 hydrophone; No.4, November 1944; 2 × 40 mm heavy machine guns; 3 × Type 96 25 mm AA guns; 36 × depth charges; 2 × Type 94 depth charge projectors; 2 × depth charge throwers (estimate); 1 × 13-Gō surface search radar; 1 × Type 3 active sonar; 1 × Type 93 hydrophone;

The No.4 class submarine chaser (第四号型駆潜艇,, Dai 4 Gō-gata Kusentei) was a class of submarine chasers of the Imperial Japanese Navy (IJN), serving during and after World War II. Nine vessels were built between 1937 and 1939 under the Maru 3 Programme.