12 cm/45 10th Year Type naval gun

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Type 10 120 mm dual-purpose gun
Japanese 4-gun 120 mm DP battery - Guam.jpg
A damaged dual purpose 120 mm gun from a four gun battery on Guam
Type Anti-aircraft / coastal defense gun
Place of origin Japan
Service history
In service 1921-1945
Used by  Empire of Japan
Wars Second World War
Production history
Produced 1921-1945
No. built 3000
Weight Single Mount: 10,000 kilograms (10 t)
Twin Mount: 20,300 kilograms (20.3 t)[1]
Barrel length 5.4 m (17 ft 9 in) L/45

Caliber 120 millimetres (4.7 in)
Breech Semi-automatic horizontal sliding wedge
Carriage Fixed pedestal
Elevation -5° to +75°
Traverse 360°
Rate of fire 10 to 12 rounds per minute
Muzzle velocity 825 m/s (2,710 ft/s)
Effective firing range Horizontal: 16,000 m (17,000 yd)
Vertical: 8,500 m (27,900 ft)
Maximum firing range Vertical: 10,000 m (33,000 ft) at 75°

The 12 cm/45 10th Year Type naval gun was a Japanese dual purpose weapon introduced after World War I, derived from the 12 cm/45 3rd Year Type naval gun. The 10th Year Type was designated for the year the gun was accepted,the 10th year of Emperor Taisho's reign, 1927 in the Gregorian calendar.[2]


The gun was a 120 mm dual-purpose anti-aircraft and coastal defense gun used during the World War II. It served as the secondary armament on a number of Japanese aircraft carriers and cruisers and as the primary armament on smaller ships. Available in both single and dual mounts the gun fired either high explosive or incendiary shrapnel shells that weighed 20.6 kilograms, with a complete round weighing 32.4 kilograms.[3]

Naval use[edit]

Similar weapons[edit]


  • Campbell, John (1985). Naval Weapons of World War II. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-459-4. 
  • War Department TM-E-30-480 Handbook on Japanese Military Forces September 1944


  1. ^ Campbell, Naval Weapons of WWII, p.194-95.
  2. ^ War Department TM-E-30-480 Handbook on Japanese Military Forces September 1944 p 400
  3. ^ Campbell, Naval Weapons of WWII, p.194-95.

External links[edit]

Media related to Type 10 120 mm AA Gun at Wikimedia Commons