Sokuten-class minelayer

	Kurosaki in 1934
Class overview
Name	Natsushima; Sokuten class;
Builders	Kure Naval Arsenal; Maizuru Naval Arsenal; Uchida Zōsen; Yokohama Iron Works; Yokohama Dock Company;
Operators	Imperial Japanese Navy; Japan Maritime Safety Agency; Republic of China Navy; Soviet Navy; People's Liberation Army Navy;
Succeeded by	Tsubame class
Built	? – 1921
In commission	1911–1970
Planned	13
Completed	13
Lost	4
Retired	9
General characteristics Natsushima
Type	Minelayer
Displacement	405 long tons (411 t) standard
Propulsion	2 × three expansion stages reciprocating engines; 1 × water tube boiler; 2 shafts, 600 shp (450 kW);
Complement	40
Armament	2 × Armstrong 3 in (76 mm) L/40 guns
General characteristics Sokuten class
Type	Minelayer
Displacement	405 long tons (411 t) standard
Length	45.7 m (149 ft 11 in) Lpp
Beam	7.6 m (24 ft 11 in)
Draught	2.3 m (7 ft 7 in)
Propulsion	2 × three expansion stages reciprocating engines; 2 shafts, 600 shp; Enoshima and Kurosaki; 1 × Ikeda model water tube boiler; all others; 1 × Kampon water tube boiler;
Speed	12 knots (22 km/h; 14 mph)
Endurance	Fuel:; Sokuten and Toshima; 30 tons coal; Kuroshima, Ashizaki, Katoku and Entō; 60.5 tons coal; and after the Kurokami; 70 tons coal;
Complement	40
Armament	Sokuten; 2 × Armstrong 3 in L/40 guns; all others; 1 × Type 41 76.2 mm (3.00 in) L/40 naval gun; 82 × Mk.5 naval mines; 18 × depth charges; Kurosaki, 1945; 1 × Type 41 76.2 mm L/40 gun; 2 × Type 93 13.2 mm (0.52 in) AA guns; ? × naval mines; ? × depth charges; 2 × depth charge projectors;

The Sokuten-class minelayer (測天型敷設特務艇,, Sokuten-gata Fusetsu-Tokumutei) was a class of auxiliary minelayers of the Imperial Japanese Navy (IJN), serving during the 1910s and World War II. They were called the Sokuten class from their nameship. They were also called the Toshima class after Sokuten was retired. In some sources Natsushima was included in this class. Their official class name was not mentioned in IJN official documents.