130 mm/55 B7 Pattern 1913

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.

130 mm/55 B7 Pattern 1913
Class Vehicle
Type Towed Artillery
Manufacturer Obukhov State Plant
Production Period 1913 - 1925
Origin Russia (USSR)
Country Name Origin Year
Russia (USSR) 1914
Country Name Operational Year Retirement Year
Russia (USSR) 1914 View
ManufacturerName Production From Production To Quantity
Obukhov State Plant 1913 1925 View

In 1911 OSP received an order to design a semi-automatic 130 mm/60 caliber naval gun for the Main Shipping Administration. The order asked for two prototypes, one for cartridges, one for rounds. On 12 July 1912 the cartrigde-version with a 55 caliber barrel was approved. In September 1912 it was decided to go with the hydro-spring rather than the hydro-pneumatic recoil system. Earlier an OSP designed semi-automatic breech mechanism was rejected in favor of a Vickers design.

In 1913 an initial order of 471 guns was placed with OSP. By 1 January 1917 143 guns had been delivered, with 96 due until the end of that year. The remaining 282 guns were supposed to be delivered in 1918. The first charge of guns was used to equipped the cruiser Svetlana and the Imperatritsa Mariya-class battleships of the Black Sea Fleet.

Another order of 100 guns was placed in 1913 with Vickers Ltd., of which 24 were ready for delivery by 16 September 1914. Of these 7 were shipped to Arkhangelsk in October 1914. A further 12 guns destined for Russian cruiser Varyag were delivered to Russia on the same route as the repairs of Varyag were delayed, where they were put to the defense of Saaremaa island.

The Soviet Navy retained the 130mm/55 Pattern 1913 naval gun and produced additional guns under the designation B-7, as the OSP had been renamed Works No. 232 "Bolshevik" in 1922.

In 1923, 12 guns had been placed in four coastal batteries, one in Odessa and three along the Caucasian coast.

In 1930 a minor modernizations were made to a few guns at the "Bolshevik" works, improving the loading mechanism and enhancing elevation to +40°.

Type Naval gun
Place of origin Russian
Service history
In service 1914 -
Used by Russia; Soviet Union
Wars World War I, World War II
Production history
Designed 1912
Manufacturer Obukhov State Plant, Vickers Ltd.
Produced 1913 - 1925
Number built 571
Specifications (Pattern 1913)
Weight 17,169 kilograms (37,900 lb)
Length 7,150 mm (281 in)
Barrel length 7,019 mm (276 in)
Shell HE mod 1911
Shell weight 36.86 kilograms (81.3 lb)
Caliber 130 mm (5.12 in)
Breech Welin breech block
Recoil Hydro-spring
Elevation -5° / + 30°
Traverse 360°
Rate of fire 5-8 shots/minute
Muzzle velocity 861 m/s (2,820 ft/s)
Maximum firing range 20,300 m (22,200 yd)

End notes