5"/54 caliber Mark 42 gun

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Mark 42 5"/54 Caliber Gun
5 inch/54 Mark 42 on USS Turner Joy (DD-951)
Type Deck Gun
Place of origin United States
Service history
In service 1953 - present
Used by US Navy and other navies.
Wars Vietnam and other wars
Shell 5" (127 mm)
Caliber 54

The Mark 42 5"/54 caliber gun (127mm) is a naval artillery gun mount used by the United States Navy and other countries. It consisted of the Mark 18 gun and Mark 42 gun mount. United States naval gun terminology indicates the gun fires a projectile 5 inches (127 mm) in diameter, and the barrel is 54 calibers long (barrel length is 5" × 54 = 270" or 6.9 meters.)[1] In the 1950s a gun with more range and a faster rate of fire than the 5"/38 caliber gun used in WWII was needed. Because of this reason, the gun was created concurrently with the 3"/70 Mark 26 gun for different usages. The 5"/54 Mk 42 is an automatic, dual-purpose (air / surface target) gun mount. It is usually controlled remotely from the Mk 68 Gun Fire Control System, or locally from the mount at the One Man Control (OMC) station. [2]

The self-loading gun mount weighs about 60.4 long tons including two drums under the mount holding 40 rounds of semi-fixed case type ammunition. The gun fires 70-pound (32 kg) projectiles at a velocity of 2,650 feet per second (808 m/s).[3] Maximum rate of fire is 40 rounds per minute.[4] Magazine capacity is 599 rounds per mount.[3] The Mark 42 mount originally was equipped for two on-mount gunners, one surface and one antiaircraft, but the antiaircraft gunner position was scrapped later on when the increasing speed of naval aircraft made manual aiming of antiaircraft weapons impractical. The Mark 45 lightweight (22.1 long ton)[5] gun mount began replacing the Mk 42 mount in 1971 for easier maintenance and improved reliability in new naval construction for the United States.[6]


See also

External links


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  • Cooney, David M., RADM USN (1980). Ships, Aircraft and Weapons of the United States Navy (NAVSO P-3564). U.S. Government Printing Office. 
  • Fairfield, A.P. (1921). Naval Ordnance. The Lord Baltimore Press. 
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  • Fairfield(1921)p.156
  • Seaman - Military manual for the Seaman rate
  • 3.0 3.1 Bailey(January 1983)p.106
  • O'Neil(March 1971)pp.48-49
  • O'Neil, March 1971, pp. 48-49
  • Cooney(1980)p.40