3.7 cm SK C/30

3.7 cm SK C/30
3.7 cm SK C/30 on a Dopp L C/30 stabilized mount
Type	Anti-aircraft cannon
Place of origin	Nazi Germany
Service history
In service	1935–1966
Used by	Nazi Germany Spain
Wars	Second World War
Production history
Designer	Rheinmetall
Designed	1930–1935
Manufacturer	Rheinmetall
Produced	1935–1943
Variants	3.7 cm SK C/30U
Specifications
Mass	243 kilograms (536 lb)
Length	3.074 metres (10 ft 1 in)
Barrel length	2.962 metres (9 ft 9 in) L/83
Shell	fixed, cased charge
Shell weight	0.68 kilograms (1 lb 8 oz)
Caliber	37 x 380 mm R
Action	single-shot
Breech	semi-automatic, vertical sliding-block
Elevation	depends on the mount
Traverse	360°
Rate of fire	30 rpm (practical)
Muzzle velocity	1,000 m/s (3,300 ft/s)
Effective firing range	2,000 m (6,600 ft) (effective ceiling)
Maximum firing range	8,500 m (9,300 yd) at 37.5°

The 3.7 cm SK C/30^{[Note 1]} was the German Kriegsmarine's primary 3.7 cm (1.5 in) anti-aircraft gun during the Second World War. It was superseded by the fully automatic 3.7 cm FlaK 43 late in the war.
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