12.7 cm/40 Type 89 naval gun

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.

12.7 cm/40 Type 89 naval gun
Type 89 gun mounted on Chitose
TypeNaval gun
anti-aircraft gun
Place of originJapan
Service history
In service1932–45
Used by Imperial Japanese Navy
WarsWorld War II
Production history
No. built~1500
VariantsType 88
Mass3,100 kilograms (6,834 lb)
Barrel length5,080 millimeters (16 ft 8 in) (bore length)

Shell weight20.9–23.45 kilograms (46.1–51.7 lb)
Caliber12.7-centimeter (5.0 in)
Breechhorizontal breech block
Elevation-8° to +90°[1]
Rate of fire8-14 rounds per minute
Muzzle velocity720–725 meters per second (2,360–2,380 ft/s)
Maximum firing range9,440 meters (30,970 ft) at 90° (AA ceiling)
14,800 meters (48,600 ft) at 45°

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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