10 cm/65 Type 98 naval gun

The 10 cm/65 Type 98 naval gun (六五口径九八式一〇糎高角砲), also known as the long 10cm high-angle gun (長10センチ高角砲), was a light caliber naval gun of the Imperial Japanese Navy used during World War II. It was employed on the aircraft carrier Taihō, the light cruiser Ōyodo, and Akizuki-class destroyers.[1][2] From 1945, land-based installations became more prioritized. The gun was considered by the Japanese to be their finest anti-aircraft artillery weapon. After the end of World War II, the gun remained in service on the two Japanese destroyers ceded to the Soviet Union and the Republic of China as war reparations.

A Type 98 gun mounted on the Japanese destroyer Harutsuki
TypeNaval gun
Coast defence gun
Place of originJapan
Service history
WarsWorld War II
Production history
No. built169
Mass3,053 kilograms (6,731 lb) barrel & breech
Barrel length6.73 metres (22.1 ft) bore (65 cal)

Shell13 kilograms (29 lb)
Caliber100 millimetres (3.9 in)
Elevation-10° to +90°[1]
Rate of fire20-22 RPM
Muzzle velocity1,010 m/s (3,314 ft/s)
Effective firing rangeHorizontal effective range: 14,000 metres (15,000 yd)
Vertical effective ceiling: 11,000 metres (36,000 ft)
Maximum firing rangeHorizontal:19,500 metres (21,300 yd)
Vertical: 13,000 metres (43,000 ft) at 90°

The Allied forces first captured a shore-based twin-mounting of this weapon at Iwo Jima.[3]


The 100 mm (3.9 in) L/65 caliber Type 98 gun utilized a horizontal sliding breech, in addition to either monobloc (made from a single forging) or replaceable liner construction of the barrel. The gun featured a spring-powered rammer that was cocked by means of the recoil of the gun being fired; this allowed the rammer to load the gun at any elevation. 169 of the guns were completed, with 68 being land-based. Though this oft-quoted number may be outdated, as 116 guns went to ship based mounts, 12 for Taiho and 8 each on Oyodo and the 12 Akizuki-class. One shortcoming of the gun was that it had a service life of only 350-400 effective full charges, as a result of the high muzzle velocity.[1]


These guns were used in twin gun turrets. The total weight of the mount and guns on Akizuki was 34,500 kg (76,100 lb). The mount installed on Akizuki could traverse at 12° to 16° per second and could elevate at a rate of 16° per second. It was electro-hydraulically powered and could be moved by hand in the event of an emergency.


The gun fired a 1,118 mm (44.0 in), 28 kg (62 lb), fixed, high-explosive round with a brass casing. Only nose-fused high-explosive ammunition was developed for the gun.


  1. Campbell, p. 196
  2. Osborne, p. 110-111
  3. CINCPAC, p. 38


  • Campbell, John (2002). Naval Weapons of World War Two. London: Conway Maritime Press. ISBN 0-87021-459-4.
  • Osborne, Eric (2005). Destroyers: An Illustrated History of Their Impact. Santa Barbara, CA: ABC-Clio, Inc. ISBN 1-85109-484-9.
  • CINCPOA, CINCPAC (1945). Japanese Artillery Weapons, CINCPAC-CINCPOA Bulletin 152-45, July 1945. CINCPAC-CINCPOA.
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