Surface Combatant Weapon System

Mk-45 gun

Mod.2 (5-inch/54-caliber) / Mod.4 (5-inch/62-caliber)

 

 

Mk-45 Mod.4 naval gun aboard USS Winston S. Churchill DDG-81

Mk-45 Mod.4 naval gun aboard USS Winston S. Churchill (DDG-81)

 

 

The 5-inch/54-caliber (Mk-45) lightweight gun is a modern U.S. naval artillery gun mount consisting of a 5-inch (127 mm) L54 Mark 19 gun on the Mark 45 mount. Originally, the gun was designed and built by United Defense, it is now manufactured by BAE Systems Land & Armaments after the former was acquired. The latest 5-inch/62-caliber version consist of a longer barrel L62 Mark 36 gun fitted on the same Mark 45 mount. The gun is designed for use against surface warships, anti-aircraft and shore bombardment to support amphibious operations.

The gun mount features an automatic loader with a capacity of 20 rounds. These can be fired under full automatic control, taking a little over a minute to exhaust those rounds at maximum fire rate. For sustained use, the gun mount would be occupied by a three-man crew (gun captain, panel operator, and ammunition loader) below deck to keep the gun continuously supplied with ammunition.


History:

Development started in the 1960s as a replacement for the 5"/54 caliber Mark 42 gun system with a new, lighter, and easier to maintain gun mounting. In USN use, the Mark 45 is used with either the Mk 86 Gun Fire Control System or the Mk 160 Gun Computing System. Since before World War II, 5" has been the standard gun caliber for U.S. Naval ships. Its rate of fire is lower than the British 4.5-inch (114 mm) gun, but it fires a heavier 5" shell which carries a larger burst charge that increases its per-shell effectiveness against aircraft.


Variants:

Mod 0: used mechanical fuze setter. Two piece rifled construction, with replaceable liner.
Mod 1: electronic fuze setter replaces the mechanical one. Made with a unitary construction barrel, which has a life span approximately

            twice that of the Mark 42 gun.
Mod 2: export version of Mod 1, but now used in the US Navy (DDG 51-80 / CG’s)
Mod 3: same gun with a new control system; never put into production.
Mod 4: longer 62 caliber barrel for more complete propellant combustion, higher velocity,

            greater range at +20 nm (36 km) and thus more utility for land attack

 

 

Technical data:

Caliber: 5 inch (127 mm)

Barrel lenght: Mod.2: 270 inch (6,86 meters) / Mod.4: 310 inch (7,87 meters)

Shell: 70 lb (31,75 kg)

Elevation: - 15° to + 65°

Rate of fire: 16-20 rpm

Effective Range: 13 NM (24,1 km) / Mod.4 = 20 NM (37 km)


Used on:

US Navy
Ticonderoga class CG

Arleigh Burke class DDG

California class CGN

Virginia class CGN

Spruance class DD

Kidd class DDG

Tarawa class LHA

 

and ships of the following Navys:

Australia, Danmark, Greece, Japan, Taiwan, New Zealand, Spain, Thailand, South Korea, Turkey.

 

images

 

Mk 45 mod.2 127mm 5-inch naval gun system

Mk-45 Mod.2 naval gun aboard USS Barry (DDG-52)

 

Mk-45 Mod.2 gun aboard USS Kidd DDG-993

Mk-45 Mod.2 naval gun aboard USS Kidd (DDG-993)

 

Mk-45 Mod.2 naval gun aboard USS Philippine Sea (CG-58)

 

Mk-45 Mod.2 naval gun aboard USS Vella Gulf (CG 72)

 

Mk-45 Mod.2 naval gun aboard USS Antietam (CG 54)

 

Mk-45 Mod.2 5"/54 naval gun aboard USS O'Bannon DD 987

Mk-45 Mod.2 naval gun aboard USS O’Bannon (DD-987)

 

Mk-45 Mod.2 naval gun aboard USS Thomas S. Gates CG-51

Mk-45 Mod.2 naval gun aboard USS Thomas S. Gates (CG-51)

 

Mk-45 Mod.2 naval gun aboard USS Vella Gulf CG-72

Mk-45 Mod.2 naval gun aboard USS Vella Gulf (CG-72)

 

Mk-45 Mod.2 5"/54 5-inch 54 caliber naval gun system aboard USS Cape St. George CG-71

Mk-45 Mod.2 naval gun aboard USS Cape St. George (CG-71)

 

Mk-45 Mod.2 naval gun aboard USS Arleigh Burke (DDG 51)

 

Mk-45 Mod.2 naval gun aboard USS John S. McCain (DDG 56)

 

Mk-45 Mod.2 naval gun aboard USS Oscar Austin (DDG 79)

 

Mk-45 Mod.2 naval gun aboard USS Barry DDG-52

Mk-45 Mod.2 naval gun aboard USS Barry (DDG-52)

 

Mk-45 Mod.2 Naval Gun aboard USS John Paul Jones DDG-53

Mk-45 Mod.2 naval gun aboard USS John Paul Jones (DDG-53)

 

Mk-45 Mod.2 naval gun aboard USS Curtis Wilbur DDG-54

Mk-45 Mod.2 naval gun aboard USS Curtis Wilbur (DDG-54)

 

Mk-45 Mod.2 naval gun aboard USS Curtis Wilbur DDG-54

Mk-45 Mod.2 naval gun aboard USS Curtis Wilbur (DDG-54)

 

Mk-45 naval gun aboard USS John S. McCain

Mk-45 Mod.2 naval gun aboard USS John S. McCain (DDG-56)

 

mk 45 mod.2 5" gun spruance class destroyer

Mk-45 Mod.2 naval gun aboard USS Spruance (DD 963)

 

Mk-45 Mod.2 naval gun aboard USS Mahan DDG-72

Mk-45 Mod.2 naval gun aboard USS Mahan (DDG-72)

 

 

 

Mk-45 Mod.4 naval gun aboard USS Sampson (DDG 102)

 

Mk-45 Mod.4 naval gun aboard USS Nitze (DDG 94)

 

Mk-45 Mod.4 naval gun aboard USS Pinckney DDG-95

Mk-45 Mod.4 naval gun aboard USS Pinckney (DDG 95)

 

Mk-45 Mod.4 5-inch 62-caliber gun system

Mk-45 Mod.4 naval gun aboard USS Pinckney (DDG 95)

 

Mk-45 5"/62 caliber gun system DDG-95 USS Pinckney

Mk-45 Mod.4 naval gun aboard USS Pinckney (DDG-95)

 

Mk-45 Mod.4 naval gun aboard USS Lassen (DDG-82)

 

Mk-45 Mod.4 naval gun aboard USS Bainbridge DDG-96

Mk-45 Mod.4 naval gun aboard USS Bainbridge (DDG-96)

 

Mk-45 Mod.4 5-inch 62-caliber gun Arleigh Burke class DDG

Mk-45 Mod.4 naval gun aboard USS Forrest Sherman (DDG-98)

 

Mk-45 Mod. 4 5"/62 5 inch 62 caliber gun USS Jason Dunham DDG-109 US Navy

Mk-45 Mod.4 naval gun aboard USS Jason Dunham (DDG-109)

 

Mk-45 Mod.4 5"/62 caliber gun system

Mk-45 Mod.4 naval gun aboard USS Jason Dunham (DDG-109)

 

Mk-45 Mod.4 5"/62 5-inch 62 caliber naval gun system Arleigh Burke class destroyer US Navy

Mk-45 Mod.4 naval gun aboard USS Jason Dunham (DDG-109)

 

Mk-45 Mod.4 5 inch 62 caliber 5"/62 gun system Arleigh Burke class flight IIa

Mk-45 Mod.4 naval gun aboard USS Jason Dunham (DDG-109)

 

Mk 45 mod 4 gun aboard uss momsen ddg-92

Mk-45 Mod.4 naval gun aboard USS Momsen (DDG-92)

 

 

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