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Surface Vessel Weapon System
Mk-42 gun
(5"/54-caliber / 127mm)
 
 
mk-42 5"/54 5-inches 54-caliber naval gun 01
Mk-42 gun aboard JDS Shirane (DDH 143)
 
  
The Mark 42 5"/54 caliber gun (127mm) is a naval gun (naval artillery) 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 (127.0 mm) in diameter, and the barrel is 54 calibers long (barrel length is 5" × 54 = 270" or 6.9 meters.) 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.

The self-loading gun mount weighs about 60.4 long tons (61.4 t) including two drums under the mount holding 40 rounds of semi-fixed case type ammunition. The gun fires 31.75 kg (70.0 lb) projectiles at a velocity of 2,650 ft/s (807.7 m/s). Maximum rate of fire is 40 rounds per minute. Magazine capacity is 599 rounds per mount. 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 tons (22.5 t)) gun mount began replacing the Mk 42 mount in 1971 for easier maintenance and improved reliability in new naval construction for the United States Navy.

Manufacturer: FMC Corporation (later United Defense / now a part of BAE Systems)


Technical data:
Caliber: 5 inch (127 mm)
Barrel lenght: 270 inch (6,86 meters)
Shell: 70 lb (31,75 kg)
Elevation: - 15° to + 85°
Rate of fire: designed: 40 rpm / downrated to 28 rpm in 1968
Range: 12,8 nmi (23,70 km) at +45° elevation / 8,5 nmi (15,7 km) at +85° elevation

Used on:
US Navy:
First used on USS Northampton (CLC 1)
Forrestal class CV
Belknap class CG
USS Truxtun (CGN 35)
Forrest Sherman class DD
Mitscher class DD
Charles F. Adams class DDG
Farragut class DDG
Knox class FF


and ships of the following Navies:
Australia, Egypt, Germany, Greece, Japan, Mexico, Spain, Taiwan, Thailand, Turkey
  

images


mk-42 5" 54-caliber 127mm naval gun knox class frigate
Mk-42 (5"/54-caliber - 127mm) naval gun aboard USS Capodanno (FF 1093)

mk-42 5" 54 caliber 127mm naval gun charles f. adams class destroyer
Mk-42 (5"/54-caliber) naval gun aboard USS Goldsborough (DDG 20)

mk-42 5-inches 54 caliber 5"54 naval gun hatakaze class ddg 02
Mk-42  gun aboard a JMSDF Hatakaze class Guided Missile Destroyer DDG


mk-42 naval gun 127mm 5 inches
Mk-42 (5"/54-caliber - 127mm) naval gun aboard USS Badger (FF 1071)

mk-42 5" 54 caliber 127 mm gun farragut coontz class destroyer ddg
Mk-42 (5"/54-caliber) naval gun aboard USS King (DDG 41)

mk-42 5" 54 caliber 127mm naval gun
Mk-42 (5"/54-caliber) naval gun aboard a Charles F. Adams class DDG


Mk-42 (5"/54-caliber) naval gun aboard a Charles F. Adams class DDG

mk-42 5-inch 54-caliber 127mm gun
Mk-42 (5"/54-caliber) naval gun and Mk-13 missile launcher aboard USS Semmes (DDG 18)

mark 42 5 inches gun
Mk-42 (5"/54-caliber) naval gun aboard a Charles F. Adams class DDG


Mk-42 (5"/54-caliber) naval gun aboard a Belknap class CG

mk-42 5" 54 caliber 127mm gun jds haruna ddh-141
Mk-42 (5"/54-caliber) naval guns aboard JDS Haruna (DDH 141)

mk-42 5" 54-caliber 127mm naval gun hatakaze class destroyer ddg
Mk-42 gun aboard a JMSDF Hatakaze class Guided Missile Destroyer DDG

mk-42 5-inches 54 caliber 5"54 naval gun hatakaze class ddg 06
Mk-42 gun aboard a JMSDF Hatakaze class Guided Missile Destroyer DDG

mk-42 5"/54 naval gun japan maritime self defense force jmsdf ddg
Mk-42 gun aboard a JMSDF Hatakaze class Guided Missile Destroyer DDG

mk-42 5" 54 caliber gun jds hiei ddh-142
Mk-42 (5"/54-caliber) naval guns aboard JDS Hiei (DDH 142)

mk-42 5" 54-caliber 127mm naval gun haruna class destroyer ddh
Mk-42 (5"/54-caliber) naval guns aboard JDS Haruna (DDH 141)


Mk-42 (5"/54-caliber) naval guns aboard JDS Haruna (DDH 141)

mk-42 5" 54 caliber 127mm naval gun shirane class helicopter destroyer ddh
Mk-42 guns aboard a JMSDF Shirane class Helicopter Destroyer / DDH


Mk-42 guns aboard a JMSDF Shirane class Helicopter Destroyer / DDH


Mk-42 guns aboard a JMSDF Shirane class Helicopter Destroyer / DDH


Mk-42 guns aboard a JMSDF Shirane class Helicopter Destroyer / DDH

mk-42 127mm 5"/54 naval gun farragut class ddg
Mk-42 (5"/54-caliber) naval gun aboard USS William V. Pratt (DDG 44)


Mk-42 (5"/54-caliber) naval gun aboard USS Capodanno (FF 1093)


Mk-42 (5"/54-caliber) naval gun aboard a Knox class Frigate


Mk-42 (5"/54-caliber) naval gun aboard USS Fox (CG 33)

mk-42 5"/54 gun
Mk-42 (5"/54-caliber) gun on a test platform


Mk-42 (5"/54-caliber) gun on a test platform


Mk-42 (5"/54-caliber) gun on a test platform

mk-42 5 inches 54 caliber gun maintenance
Mk-42 (5"/54-caliber) gun during maintenance


Mk-42 (5"/54-caliber) gun during maintenance


Mk-42 (5"/54-caliber) gun housing
 
 
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