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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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