Bofors 57 mm Naval Automatic Gun L/60

Bofors 57 mm Naval Automatic Gun L/60
Swedish Bofors 57 mm SAK 60 (57 mm akan m/50) on the destroyer HSwMS Småland
Type	Naval Gun
Place of origin	Sweden
Service history
In service	1952–1990
Used by	Dutch Navy Swedish Navy French Navy
Production history
Designed	1950
Manufacturer	Bofors
Produced	1950
Specifications
Mass	Traversing mass: 24 t (24 long tons; 26 short tons)
Barrel length	60 calibres 3.420 m (11.22 ft)
Crew	8
Shell	57 × 438 mm R (m/50)
Shell weight	2.6 kg (5.7 lb)
Calibre	57 mm (2.2 in)
Elevation	-9°/+90°, 30°/s
Traverse	-360°, 30°/s
Rate of fire	2 × 130 rounds/min
Muzzle velocity	850–920 m/s (2,800–3,000 ft/s)
Effective firing range	13,000 m (43,000 ft) (max) 5,000 m (16,000 ft) (practical) 5,500 m (18,000 ft) AA ceiling

Bofors 57 mm Naval Automatic Gun L/60 (Swedish: 57 mm sjöautomatkanon L/60 (57 mm SAK 60)),^[1][2] also known as 57 mm/60 (2.25") SAK Model 1950^[3] and the like (full English product name: Bofors 57 mm Automatic A.A. Gun L/60 In Stabilized Twin Turret),^[4] was a twin-barreled 57 mm (2.2 in) caliber fully automatic dual purpose naval artillery piece designed by the Swedish arms manufacturer Bofors from the early 1940s to the early 1950s to meet a request from the Dutch Navy.^[1] Besides the Dutch Navy, the weapon was also adopted by the Swedish and the French Navy, most predominantly by the latter.^[3]