3.7 cm Flak M42

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3.7 cm/69 Flak M42[1]
3.7cm Flak M42 LM42U.png
A single 3.7 cm Flak M42U gun on the LM 42U mount.
Place of originNazi Germany
Service history
In service1943–1945
Used byKriegsmarine
WarsWorld War II
Production history
Specifications (3.7 cm Flak M42)
Weight109 kg (240 lb)
Barrel length2.560 cm (1.008 in) bore (69 calibers)

Shell37 × 355 mm
Shell weight635–700 g (1.400–1.543 lb)
Caliber37 mm (1.5 in)
Breechsliding breech block
Elevation-10° to +90°
Rate of fire150 rounds per minute
Muzzle velocity815–865 m/s (2,670–2,840 ft/s)
Effective firing range
  • 4,800 m (5,200 yd) at 85° elevation
  • 6,400 m (7,000 yd) at 45° elevation
Feed system5-round clips

The 3.7 cm Flak M42 was the marine version of the 3.7-centimetre (1.5 in) Flak 36/37 and used by the Kriegsmarine on surface ships and as the M42U on Type VII and Type IX U-boats. The 3.7 cm Flak M42U used several types of mounts and entered service in autumn 1943.[2]

3.7 cm Flak M42[edit]

The 3.7 cm Flak M42 was a longer caliber version of the Wehrmacht's 3.7 cm Flak 36, 69 caliber as opposed to 57 caliber. It replaced the older 3.7 cm SK C/30 that had been designed in 1930. The gun was loaded with a five-round ammunition clip, giving it a rate of fire of 250 rounds per minute, unlike the SK C/30 which was single-shot with a rate of 30 rounds per minute. The M42 was also about 134 kg (295 lb) lighter than the SK C/30 and had gun shields.[1][3]

LM 42U Mount[edit]

The LM 42U mount was developed specifically for the 3.7 cm Flak M42U. It was manned by a 3-man crew, with a fourth man operating as the loader.[4]

DLM 42U Mount[edit]

The twin mount was based on the LM 42U design, in which the 3.7 cm Flak M42U guns were mounted side by side.[5]

LM 43U Mount[edit]

The LM 43U mount was the final design of mount used on U-boats. It was a further improvement on the LM 42U. The LM 43U was only known to be installed on these U-boats (U-249, U-826, U-977, U-1023, U-1171, U-1305 and U-1306).[5]



  1. ^ a b DiGiulian 2016.
  2. ^ Miroslaw Skwiot 2010, German Naval Guns: 1939-1945. Seaforth. p 333
  3. ^ DiGiulian 2017.
  4. ^ Miroslaw Skwiot 2010, German Naval Guns: 1939-1945. Seaforth. p 340
  5. ^ a b Miroslaw Skwiot 2010, German Naval Guns: 1939-1945. Seaforth. p 342


  • DiGiulian, Tony (30 November 2016). "Germany 3.7 cm/69 (1.5") Flak M42". NavWeaps. Retrieved 23 September 2017.
  • DiGiulian, Tony (30 April 2017). "Germany 3.7 cm/83 SK C/30". NavWeaps. Retrieved 23 September 2017.

External links[edit]