130 mm/55 B7 Pattern 1913

130mm/55 Pattern 1913 naval gun B7
TypeNaval gun
Place of originRussian
Service history
In service1914–1945?
Used byRussia; Soviet Union
WarsWorld War I, World War II
Production history
Designed1912
ManufacturerObukhov State Plant, Vickers Ltd.
Produced1913 - 1925
No. built571
Specifications (Pattern 1913)
Mass5,290 kg (11,660 lb) (gun only)
Length7,150 mm (281 in)
Barrel length7,019 mm (23 ft 0.3 in) (bore)
5,862 mm (19 ft 3 in) (rifling)

ShellHE mod 1911
Shell weight36.86 kilograms (81.3 lb)
Caliber130 mm (5.12 in)
BreechWelin breech block
RecoilHydro-spring
Elevation-5° / + 30°
Traverse360°
Rate of fire5-8 shots/minute
Muzzle velocity861 m/s (2,820 ft/s)
Maximum firing range20,300 m (22,200 yd)

The 130mm/55 B7 Pattern 1913 naval gun was a 5.1-inch naval gun used predominantly on ships of the Imperial Russian Navy and later by the Soviet Navy. It was manufactured mainly by the Obukhov State Plant (OSP) in St. Petersburg, as well as under licence by Vickers Limited in Great Britain. The gun was used as medium artillery on several Russian dreadnoughts and as main artillery on cruisers, as well as coastal artillery. It was succeeded by the 130 mm/50 B13 Pattern 1936 naval gun, which became the standard destroyer gun of the Soviet Navy during World War II.