EOC 12-inch 45-calibre naval gun

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EOC 12 inch 45-calibre naval gun
12"/45 41st Year Type
Mikasa kobu shuho.jpg
41st Year Type on Mikasa
TypeNaval gun
Place of originUnited Kingdom
Service history
In service1906-1952
Used byUnited Kingdom
Empire of Japan
WarsWorld War I
Production history
DesignerElswick Ordnance Company
Barrel lengthBore 45 feet (13.716 m) (45 cal)

Shell850 pounds (385.6 kg)
Calibre12-inch (304.8 mm)
Muzzle velocity2,700 feet per second (823 m/s) - 2,800 feet per second (853 m/s)
Maximum firing range18,850 yards (17,240 m)

The EOC 12 inch 45 calibre gun were various similar 12-inch wire-wound naval guns designed and manufactured by Elswick Ordnance Company to equip ships that the parent company Armstrong Whitworth built and/or armed for several countries before World War I.


Brazil service[edit]

Elswick supplied its 12-inch 45-calibre guns for the Minas Geraes-class battleships completed by itself and Vickers in 1910 for Brazil.

UK service[edit]

Section of barbette and gunhouse of HMS Agincourt

When World War I began, Elswick were completing the battleship Sultân Osmân-ı Evvel for the Ottoman Empire, originally begun as Rio de Janeiro for Brazil. It was armed with 14 of a slightly later version of Elswick's 12-inch 45-calibre guns. The battleship was completed as HMS Agincourt and served in the Royal Navy in World War I, with its guns designated BL 12 inch Mk XIII.[1] The gun's performance was similar to the standard Royal Navy equivalent gun, the BL 12 inch Mk X designed by Vickers.

Japan service[edit]

Elswick supplied its 12-inch 45-calibre guns to the Imperial Japanese Navy, and they were also manufactured under licence in Japan. In Japanese service from 1908 they became 12"/45 41st Year Type and later after the navy metricised in 1917, 30 cm/45 41st Year Type. They equipped the following ship classes :

Surviving examples[edit]

See also[edit]

Weapons of comparable role, performance and era[edit]


  1. ^ Britain used Roman numerals to denote Marks (models) of ordnance until after World War II. This was the thirteenth model of BL 12-inch gun in British service.


External links[edit]