Modified A Class, Japanese Submarines

Photograph of modified A class submarine Fair use may apply.



2620 tons standard displacement
3603 tons surfaced
4762 tons submerged


340'3" by 38'5" by 19'4"
103.71m by 11.71m by 5.89m

Maximum speed      

16.7 knots (surfaced)
5.5 knots (submerged)
Dive to 330 feet (100 m)
Aircraft 2 M6A Seiran seaplanes


1 5.5"/50 gun
2x3, 1x1 25mm/60 machine gun
6 21" torpedo tubes (12 torpedoes)
2-shaft diesel (4400 hp) or electric (600 hp)
Range 21,000 nautical miles (39,000 km) at 16 knots surfaced
60 nautical miles (110 km) at 3 knots submerged
Modifications At some point, the units of this class were fitted with schnorkels

The modified As were based on the I-12 (A2). They were very large submarines capable of carrying two seaplanes each. The boats also had an anechoic coating of synthetic rubber mixed with sand with a thin plastic covering and were equipped with snorkels. The submarines were modified specifically to reinforce the Sen-toku class submarines in their strike against the Panama Canal.

We list here only those units that were completed before the surrender. Two additional units were laid down but not completed and three more units ordered but never laid down.

Units in the Pacific:


Completed 1944-12-16 (Kawasaki-Kobe)      

Sunk 1945-7-16 off Yokosuka by Lawrence C. Taylor and aircraft from Anzio
I-14 Completed 1945-3-14 (Kawasaki-Kobe)      


Boyd and Yoshida (1995)

Carpenter and Polmar (1986) (accessed 2 January 2007)

Jentschura, Jung, and Mickel (1977)

Worth (2001)

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