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BL 6 inch Mk XII naval gun

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Title: BL 6 inch Mk XII naval gun  
Author: World Heritage Encyclopedia
Language: English
Subject: M29-class monitor, HMS M33, Town-class cruiser (1910), C-class cruiser, HMS Raglan, HMS Galatea (1914), Arethusa-class cruiser (1913), HMS Arethusa (1913), John Henry Carless, HMS Castor (1915)
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BL 6 inch Mk XII naval gun

BL 6 inch gun Mk XII
Battle of Jutland
Type Naval gun
Place of origin  United Kingdom
Service history
In service 1914 - 1945
Used by British Empire
Wars World War I World War II
Production history
Designer Vickers
Designed 1913
Manufacturer Vickers
Number built 463
Weight 15,512 pounds (7,036 kg) barrel & breech[1]
Barrel length 270 inches (6.858 m) bore (45 cal)[2]

Shell 100 pounds (45.36 kg) Lyddite, Armour-piercing, Shrapnel[3]
Calibre 6 inches (152.4 mm)
Breech Welin interrupted screw
Recoil Hydro-spring, 16.5 inches (420 mm)[6]
Elevation -7° - 30°[7]
Muzzle velocity 2,825 feet per second (861 m/s)[4]
Maximum range 19,660 metres (21,500 yd)[5]

The BL 6 inch Gun Mark XII[8] was a British 45 calibres naval gun which was mounted as primary armament on light cruisers and secondary armament on dreadnought battleships commissioned in the period 1914 - 1926, and remained in service on many warships until the end of World War II.


This was a high-velocity naval gun consisting of inner "A" tube, "A" tube, wound with successive layers of steel wire, with a jacket over the wire.[9]

Naval service

It superseded the 45-calibres Mk VII gun and the longer 50-calibres Mk XI gun which had proved unwieldy in light cruisers due to its length, and was Britain's most modern 6-inch naval gun when World War I began.

Guns were mounted in the following ships :

Coast defence gun

During WWII some Mk XII guns were used in emergency coast defense batteries.[10]

Notable actions


This gun generated a higher pressure in the chamber on firing compared to preceding 6-inch guns such as Mk VII and Mk XI. This necessitated use of special shells capable of withstanding a pressure of 20 tons per square inch on firing, which had "Q" suffixed to the name. World War I shells were marked "A.Q." denoting special 4 C.R.H. shells for this gun.[1]

See also

Weapons of comparable role, performance and era

Surviving examples

Notes and references


  • "Admiralty, Gunnery Branch, 1917.

External links

  • Tony DiGiulian, British 6"/45 (15.2 cm) BL Mark XII and Mark XX
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