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10 cm/50 Type 88 naval gun
Japanese submarine I-165 in 1932.jpg
A 10 cm/50 Type 88 naval gun aboard I-165 in 1932.
Type Naval gun
Place of origin Japan
Service history
In service 1932–1945
Used by Imperial Japanese Navy
Wars World War II
Production history
Designed 1928
Weight 2,830 kg (6,240 lb)
Length 5.3 m (17 ft 5 in)
Barrel length 5 m (16 ft 5 in)[1]

Shell Fixed Quick Fire
100 mm x 380 mm[2]
Shell weight 13 kg (29 lb)
Caliber 100 mm (3.9 in)
Breech Horizontal sliding block
Recoil Hydro-pneumatic
Carriage Central Pivot
Elevation -7° to +90°
Traverse -150° to +150°[2]
Rate of fire Theoretical: 12 rpm
Practical: 6 rpm
Muzzle velocity 885–895 m/s (2,900–2,940 ft/s)
Effective range 11,200 m (36,700 ft) at +90°
Maximum range 16.2 km (10 mi) at +45°[1]
Feed system Manual

The 10 cm/50 Type 88 naval gun was a dual-purpose gun used by the Imperial Japanese Navy during World War II.


There were two variants of the 10 cm/50 Type 88 naval gun. One variant had a removable barrel liner while the other had an autofretted monoblock barrel.[2] Both variants had horizontal sliding block breaches, hydro-pneumatic recoil mechanism, and Fixed Quick Fire ammunition. They were dual-purpose guns mounted on HA/LA central pivot mounts with a wide range of elevation that allowed the guns to be used against surface and aerial targets. The gun was capable of a theoretical rate of fire of 12 rounds per minute but this was limited to a practical rate of fire of 6 rounds per minute due to the speed of the pneumatic shell hoist.[1]


The 10 cm/50 Type 88 naval gun was used as a Deck gun aboard I-165 class Type KD5 submarines of the Imperial Japanese Navy during World War II.[1]



  • Campbell, John (1985). Naval Weapons of World War II. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-459-4. 

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