14 cm/40 11th Year Type naval gun

14 cm/40 11th Year Type naval gun

14 cm/40 11th Year Type naval gun aboard Japanese submarine I-400 being inspected by United States Navy personnel.
Type Naval gun
Place of origin Empire of Japan
Service history
In service 1922–1945
Used by Imperial Japanese Navy
Wars World War II
Weight 3,900 kilograms (8,598 lb)
Length 5.9 meters (19 ft 4 in)
Barrel length 5.6 meters (18 ft 4 in) (bore length)

Shell separate-loading, brass case
Shell weight 38 kilograms (84 lb)
Caliber 14-centimeter (5.5 in)
Breech Horizontal sliding breech block
Elevation +30°  to −5° 
Rate of fire 5 rounds per minute
Muzzle velocity 700 meters per second (2,300 ft/s)
Maximum firing range 16,000 meters (17,000 yd)

The 14 cm/40 11th Year Type naval gun was the standard surface battery for Japanese submarine cruisers of World War II. Most carried single guns, but Junsen type submarines carried two. Japanese submarines I-7 and I-8 carried an unusual twin mounting capable of elevating to 40° . Eleventh year type refers to the horizontal sliding breech block on these guns. Breech block design began in 1922 CE, the eleventh year of the Taishō period.[1] The gun fired a projectile 14 centimeters (5.5 in) in diameter, and the barrel was 40 calibers long (barrel length is 14 cm x 40 = 560 centimeters or 220 inches).[2]

Coastal bombardment of North America

This gun was the weapon used by I-17 to sink SS Emidio and to later shell the Ellwood Oil Field near Santa Barbara, California. It was also used by I-25 for the Bombardment of Fort Stevens in Oregon near the mouth of the Columbia River and by I-26 to shell the Estevan Point lighthouse in British Columbia.[3]

Similar weapon

A longer-barreled 14 cm/50 3rd Year Type naval gun was used aboard surface ships and for coastal defense. The 40 caliber 11th Year Type guns were intended for use against destroyers, and fired base-fuzed projectiles with thinner shell walls allowing a larger bursting charge than the 50 caliber 3rd Year Type guns for potential use against armored ships. The lower velocity 40 caliber gun had a useful life expectancy of 800 to 1000 effective full charges (EFC) per barrel.[4]


  1. Campbell 1985 pp.173 & 191
  2. Fairfield 1921 p.156
  3. Webber 1975 pp. 14–16 & 40–62
  4. Campbell 1985 pp.190–191


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