12.7 cm/40 Type 89 naval gun

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12.7 cm/40 Type 89 naval gun
127mmAA on IJN Chitose in 1938.jpg
Type 89 gun mounted on Chitose
Type Naval gun
anti-aircraft gun
Place of origin Japan
Service history
In service 1932–45
Used by Naval Ensign of Japan.svg Imperial Japanese Navy
Wars World War II
Production history
Designed 1928–32
Produced 1932–45
No. built ~1500
Variants Type 88
Weight 3,100 kilograms (6,834 lb)
Barrel length 5,080 millimeters (16 ft 8 in) (bore length)

Shell Fixed
Shell weight 20.9–23.45 kilograms (46.1–51.7 lb)
Caliber 12.7-centimeter (5.0 in)
Breech horizontal breech block
Elevation -8° to +90°[1]
Rate of fire 8-14 rounds per minute
Muzzle velocity 720–725 meters per second (2,360–2,380 ft/s)
Maximum firing range 9,440 meters (30,970 ft)
at 90° (AA ceiling)

The 12.7 cm/40 Type 89 naval gun was a Japanese anti-aircraft (AA) gun introduced before World War II. It was the Imperial Japanese Navy's standard heavy AA gun during the war.

The Type 89 was adopted by the IJN on February 6, 1932, and was the primary anti-aircraft gun on new aircraft carriers, battleships and cruisers, most commonly installed in twin gun mounts. As IJN ships were upgraded in the 1930s and 1940s, older AA guns such as 8 cm/40 3rd Year Type naval gun and 12 cm/45 10th Year Type naval guns were replaced with Type 89's.


  1. ^ Campbell, Naval Weapons of WWII, p.193.


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

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