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20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called " guns ", from larger-caliber " cannons " (e.g. machine gun vs. autocannon ), is conventionally taken to be the 20 mm round, the smallest caliber of autocannon.
The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used. [2] [3]
The USAF introduced the 20 mm M39 cannon to replace the M24, while the Navy combined the original Hispano design with a lighter round for better muzzle velocity in the Colt Mk 12 cannon. [16] As a ground vehicle-mounted gun, either anti-aircraft or as a general-purpose autocannon, the HS.404 lasted into the 1960s.
It was used for pistol and submachine gun ammunition and held 2,000 rounds in cartons (100 x 20-round cartons or 40 x 50-round cartons). It could also be used to hold 960 rounds of Caliber .30 ammo (48 x 20-round cartons) or 240 rounds of Caliber .50 (24 x 10-round cartons) ammo.
Becker Type M2 20 mm cannon German Empire: World War I 20: Internal: Nkm wz.38 FK Poland: Interwar 20: Internal: Polsten Poland: World War II 20: Internal: Berezin B-20 Soviet Union: World War II 20: Internal: ShVAK cannon Soviet Union: World War II 20: Internal: Ho-1 cannon Empire of Japan: World War II 20: Internal: Ho-3 cannon Empire of ...
The M61 Vulcan is a hydraulically, electrically, or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon which fires 20 mm × 102 mm (0.787 in × 4.016 in) rounds at an extremely high rate (typically 6,000 rounds per minute).
The basic design was based on the original Oerlikon 20 mm cannon, in turn based on the German Empire's Becker 20 mm cannon of World War I. In the post-war period, Oerlikon had developed the original design to produce three autocannons with increasingly powerful rounds; the original model, later known as the "F", used the Becker 20x70mm round ...
The HS.820 is a 20 mm caliber autocannon developed by Hispano-Suiza primarily for aircraft use, but more widely used in a series of ground-based anti-aircraft guns. After Oerlikon purchased Hispano's armaments division in 1970, the HS.820 became the Oerlikon KAD, supplanting Oerlikon's own KAA and KAB weapons in the process. [1]