The 5 cm (2.0 in) SK L/40 gun weighed 280 kilograms (620 lb) and had an overall length of 2 m (6 ft 7 in). It was originally designed in 1892 and adapted for use on torpedo boats and u-boats in 1913.
- SK - Schnelladekanone (quick loading cannon); L - Länge in Kaliber (length in caliber)
- Campbell, John (2002). Naval Weapons of World War Two. London: Conway Maritime Press. ISBN 0-87021-459-4.
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