BK 3.7 (37 mm)

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The 37 mm BK 3.7 is a German autocannon that was used by the Luftwaffe during World War II. It was mounted on a variety of aircraft and also used by the Soviet Union, who captured a number of the guns from the Germans.

Vehicles equipped with this weapon

General info

Tell us about the tactical and technical characteristics of the cannon or machine gun.

Available ammunition

  • Default: HVAP-T · HEF-T
  • Armored targets: HVAP-T
  • Air targets: HEF-T

Penetration statistics
Ammunition Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
HVAP-T 108 101 75 51 35 24
HEF-T 7 7 5 4 4 4
Shell details
Ammunition Velocity
mass (kg)
Fuse delay
Fuse sensitivity
Explosive mass
(TNT equivalent) (g)
0% 50% 100%
HVAP-T 1,150 0.41 - - - 66° 70° 72°
HEF-T 914 0.55 0.4 0.2 108 79° 80° 81°

Comparison with analogues

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Usage in battles

Against armour, the 37 mm cannon should be used to fire at the roof or sides of medium tanks and light tanks. Against heavy tanks, the 37 mm should be used to knock out the engine, tracks or other important modules as it would not have sufficient penetration.

Pros and cons


  • HVAP-T shells have excellent penetration against armour


  • Packs a small amount of ammo in all but the Bf 110 G-2 gun pod
  • HEF-T shell doesn't have as much effect as Minengeschoss from 30 mm
  • Too slow rate of fire to be practical in a dogfight


Examine the history of the creation and combat usage of the weapon in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the weapon and adding a block "/History" (example: https://wiki.warthunder.com/(Weapon-name)/History) and add a link to it here using the main template. Be sure to reference text and sources by using <ref></ref>, as well as adding them at the end of the article with <references />.


Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

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  • reference to the article about the variant of the cannon/machine gun;
  • references to approximate analogues by other nations and research trees.

External links

Germany aircraft cannons
15 mm  MG 151
20 mm  MG 151 · MG C/30L · MG FF · MG FF/M
27 mm  Mauser BK27
30 mm  MK 101 · MK 103 · MK 108
37 mm  BK 3.7
50 mm  BK 5 · Mk.214a
75 mm  BK 7.5
20 mm  Hispano Mk.V (Britain) · M24A1 (USA) · M61A1 (USA) · ShVAK (USSR)
23 mm  GSh-23L (USSR) · NR-23 (USSR) · VYa-23 (USSR)
30 mm  DEFA 552 (France) · GSh-30-2K (USSR) · NR-30 (USSR)
37 mm  N-37D (USSR)

Italy aircraft cannons
20 mm  Hispano 404 (France) · Hispano Mk.II (Britain) · Hispano Mk.V (Britain) · M24A1 (USA) · M61A1 (USA) · TM197B
  MG 151 (Germany) · MG FF (Germany) · MG FF/M (Germany)
27 mm  Mauser BK27 (Germany)
30 mm  DEFA 552 (France) · Hispano HS 825 · MK 103 (Germany) · MK 108 (Germany)
37 mm  BK 3.7 (Germany) · Breda Model 39 37/54
102 mm  102/35 mod 14