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10.5 cm SK C/32
Bundesarchiv Bild 101II-MW-4006-20, U-Boot U-123 in See.jpg
U-123 SK C/32 deck gun.
Type Naval gun
Place of origin Nazi Germany
Service history
In service 1936—1945
Used by  Nazi Germany
Wars World War II
Weight 1,585–1,785 kilograms (3,494–3,935 lb)[1]
Length 4.74–4.86 meters (15 ft 7 in–15 ft 11 in)[1]
Barrel length 4.4 meters (14 ft 5 in)[1] (bore length)

Shell Fixed
Caliber 105 millimeters (4.1 in)[1]
Muzzle velocity 785 m/s (2,580 ft/s)[1]
Maximum range 15 kilometers (16,000 yd) at 44.4°  elevation[1]

The 10.5 cm SK C/32 (SK - Schnelladekanone (quick loading cannon) C - Construktionsjahr (year of design) was a German naval gun used in World War II. This was the standard unshielded low-angle deck gun mounted forward of the conning tower in type I, type IX and type X U-boats. The guns were also used in shielded high-angle mountings aboard type 35 and type 43 minesweepers, Elbing class torpedo boats, cruiser Emden, and old battleships Schlesien and Schleswig-Holstein.[1]


The built-up gun with a barrel, jacket and breech end piece weighed about 1.8 tons. The gun fired a 15.1 kg (33 lb) projectile 105 mm in diameter, and the barrel is sometimes described as 45 caliber. Fixed ammunition (case and projectile handled as a single assembled unit) containing a 4.08-kilogram (9.0 lb) propellant charge was 105-centimetre (41 in) long. Ceiling was 10,300-metre (33,800 ft) at 80°  elevation. Useful life expectancy was 4100 effective full charges (EFC) per barrel.[1]

U-boat history[]

The Ubts LC/32 mounting used in type I and early type IX U-boats weighed about 5 tonnes and could be elevated from -10°  to +35° . Later type IX and type XB U-boats used the Ubts LC/36 mounting reducing weight by 10 percent by restricting elevation from -10°  to +30° .[1] During the early war years, these guns were used to encourage surrender of independently routed merchant ships or to sink ships damaged by torpedoes.[2] Some of these guns were later removed from U-boats for mounting aboard type 40 minesweepers after unshielded deck guns proved impractical in action against Defensively Equipped Merchant Ships and escorted trade convoys.[3]

Coastal defence gun[]

105 mm SK C/32 on display at Fjell Fortress, Norway

Norway used this gun in coastal defence batteries until 2002.

See also[]

Weapons of comparable role, performance and era[]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Campbell pp.248&249
  2. Blair p.63
  3. Lenton pp.126&127


  • Blair, Clay (1996). Hitler's U-Boat War: The Hunters 1939-1942. New York: Random House. ISBN 0-394-58839-8. 
  • Campbell, John (2002). Naval Weapons of World War Two. London: Conway Maritime Press. ISBN 0-87021-459-4. 
  • Lenton, H.T. (1976). German Warships of the Second World War. New York: Arco. ISBN 0-668-04037-8. 

External links[]

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