STS Class, Japanese Submarines

Photograph of STS-class submarine

Polmar (1986). Via Wikimedia Commons


Tonnage 320 tons standard
429 tons surfaced
493 tons submerged
Dimensions 146'8" by 13'1" by 11'3"
44.70m by 3.99m by 3.43m
Maximum speed       10.5 knots surfaced
13 knots submerged
Dive To 330 feet (100 m)
Complement 22
Armament 2 21" torpedo tubes (4 torpedoes)
1 light machine gun
1-shaft diesel-electric (400 bhp surfaced, 1250 shp submerged)
Range 3000 nautical miles (5600 km) at 10 knots surfaced
100 nautical miles (190 km) at 2 knots submerged

The STS  or Sen-Taka-Sho were small coastal defense submarines that were optimized for underwater speed and equipped with a snorkel, making them "true" submarines. They were a good design for their intended role and were relatively simple to construct. In practice, their endurance was considerably greater than the design figure, as was their maximum safe dive depth, estimated by Japanese naval architects as 500 feet (150 meters). Although 90 units were planned, few were completed before the war ended. We list here only those that were completed before the surrender.

Units in the Pacific:


Completed 1945-5-31 (Sasebo)

Ha-202 Completed 1945-5-31 (Sasebo)
Ha-203 Completed 1945-6-26 (Sasebo)
Ha-204 Completed 1945-6-25 (Sasebo)
Ha-205 Completed 1945-7-3 (Sasebo)
Ha-209 Completed 1945-8-4 (Sasebo)
Ha-210 Completed 1945-8-11 (Sasebo)


Carpenter and Polmar (1986)

Jentschura, Jung, and Mickel (1977)

Worth (2001)

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