The 5 cm SK L/40 gunSK - Schnelladekanone (quick loading cannon); L - Länge in Kaliber (length in caliber) was a German naval gun used in World War I and World War II.
Service The 5 cm SK L/40 gun was primarily used as an anti-torpedo boat gun aboard avisos, corvettes, gunboats, protected cruisers, submarines, torpedo boats, and unprotected cruisers. It was used by the navies of the German Empire, Nazi Germany, Belgium, and The Netherlands.
Ship classes that carried the 5 cm SK L/40 include: A-class torpedo boats Type UB II submarines S7-class torpedo boats S66-class torpedo boats G88-class torpedo boats s s
See also List of naval guns 5.2 cm SK L/55 naval gun
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External links http://www.navweaps.com/Weapons/WNGER_5cm-40_skc93.htm