Sweden
120 mm/46 (4.7") TAK120
Updated 18 November 2006
A fully-automatic weapon intended for large Fast Attack Craft (FAC).  Developed on a private-venture basis from an anti-aircraft field gun.

Uses a water-cooled barrel with a replaceable liner and a vertical-sliding breech block, which opens downward during recoil.  The gun feeds alternatively from two magazines, one on each side of the barrel.  Each of these magazines holds five rounds.  This arrangement allows for two different kinds of ammunition to be loaded so that the gun can be immediately switched between ammunition types.

The automatic loader uses a spring-powered rammer, which is cocked by the recoil forces.
WNSweden_47-46_TAK120_sketch_pic.jpg

Bofors sketch of 120 mm/46 TAK 120
Dimensions are in millimeters
WNSweden_47-46_TAK120_factory_pic.jpg

120 mm/46 TAK120 guns under construction
Rails on sides are for rocket flares
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Gun Characteristics
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Designation 120 mm/46 (4.7") TAK120
Ship Class Used On Finland:  Turunmaa class and Pohjanmaa
Indonesia:  Fatahilla class
Date Of Design 1963
Date In Service 1967 (first prototype tested)
Gun Weight N/A
Gun Length 217 in (5.520 m)
Bore Length N/A
Rifling Length N/A
Grooves 36
Lands N/A
Twist Uniform RH 1 in 27
Chamber Volume N/A
Rate Of Fire 80 rounds per minute cyclic
Note:  Pohjanmaa had this gun removed during modernization in 1996-98.  It was replaced with a Bofors 57 mm.
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Ammunition
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Type Fixed
Weight of Complete Round 77.1 lbs. (35 kg)
Projectile Types and Weights HE - 46.3 lbs. (21 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity 2,625 fps (800 mps)
Working Pressure 16.8 tons/in2 (2,650 kg/cm2)
Approximate Barrel Life N/A
Ammunition stowage per gun 10 ready rounds, 16 in turret rear, 52 in magazines
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Range
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Elevation With 46.3 lbs. (21 kg) HE Shell
Range @ 45 degrees 20,230 yards (18,500 m)
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Mount / Turret Data
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Designation Single Mounting TAK 120 L/46
Weight  28 tons (28.5 mt) not including flare rails and ammunition
Elevation -10 / +80 degrees
Elevation Rate 32 degrees per second
Train unlimited
Train Rate 40 degrees per second
Gun recoil 18.5 in (47 cm) nominal
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Data from
"Jane's Pocket Book 9:  Naval Armament" edited by Denis Archer
"The Naval Institute Guide to World Naval Weapon Systems 1991/92" by Norman Friedman
"Jane's Fighting Ships, 1999-2000" edited by Capt. Richard Sharpe RN
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"120 mm Automatic Gun L/46 in Turret Mounting" Bofors Document
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Special help from Leo Fischer