|6"/53 caliber naval gun|
|In service||1920 - 1945|
|Used by||United States|
|Wars||World War II|
|Variants||Mk 13, Mk 16, Mk 17|
|Barrel length||8 meters (315 in) bore (53 calibers)|
|Shell||105 pounds (48 kg)|
|Caliber||152 millimeters (6 in)|
|Muzzle velocity||900 meters per second (2,950 ft/s)|
|Maximum range||23,130 meters (25,295 yd)|
The 6"/53 caliber gun (spoken "six-inch-fifty-three-caliber") formed the main battery of United States Navy light cruisers and submarine cruisers built during the 1920s. United States naval gun terminology indicates the gun fired a projectile 6 inches (15 cm) in diameter, and the barrel was 53 calibers long (barrel length is 6 inch x 53 = 318 inches or 8 meters.) The gun with side swing Welin breech block and Smith-Asbury mechanism weighed about 10 tonnes and used a silk bag containing 44-pounds (20 kg) of smokeless powder to give a 105-pound (47.6 kg) projectile a velocity of 3000 feet per second (900 m/s). Early Marks were built-up guns with a liner, tube, full-length jacket, and 2 hoops; but the Mark 14 gun was of monobloc construction. Useful life expectancy was 700 effective full charges (EFC) per liner.
Mark 13 casemate mounting
These guns were intended for the secondary battery of the Lexington-class battlecruisers and South Dakota-class battleships. They were installed in Omaha-class cruisers when the intended ships were canceled under provisions of the Washington Naval Treaty. Maximum range was 21,000 yd (19,200 m) at the maximum elevation of 20 degrees.
Mark 16 turret mounting
Mark 17 wet mounting
These single open mounts were installed fore and aft of the conning tower on USS Argonaut (SM-1), USS Narwhal (SS-167), and USS Nautilus (SS-168). Maximum range was 23,300 yd (21,310 m) at the maximum elevation of 25 degrees.
- Campbell 1985 pp.132-3
- Fairfield 1921 p.156
- DiGiulian, Tony (8 February 2008). "United States of America 6"/53 (15.2 cm) Marks 12, 14, 15 and 18". Navweaps.com. Archived from the original on 30 June 2011. http://web.archive.org/web/20110630224252/http://navweaps.com/Weapons/WNUS_6-53_mk12.htm. Retrieved 2011 07 21.
- Campbell, John (1985). Naval Weapons of World War Two. Naval Institute Press. ISBN 0-87021-459-4.
- Fairfield, A.P. (1921). Naval Ordnance. The Lord Baltimore Press.
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