20 mm caliber
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20 mm caliber is a specific size of popular autocannon ammunition. It is typically used to distinguish smaller-caliber weapons, commonly called "guns", from larger-caliber "cannons" (e.g. machine gun vs. autocannon). All 20 mm cartridges have an outside projectile (bullet) diameter and barrel bore diameter of 0.787 inches (20.0 mm). These projectiles are typically 75 to 127 mm (3–5 in) long, cartridge cases are typically 75 to 152 mm (3–6 in) long, and most are shells, with an explosive payload and detonating fuze.
Weapons using this caliber range from anti-materiel rifles and anti-tank rifles to aircraft autocannons and anti-aircraft guns.
Usage
Twenty-millimeter-caliber weapons are generally not used to target individual soldiers, but have targets such as vehicles, buildings, or aircraft.
Types of ammunition
- High explosive (HE)
- High explosive incendiary (HEI)
- Armor-piercing (AP)
- Semi-armor-piercing high explosive incendiary (SAPHEI)
- Armor-piercing discarding sabot (APDS)
- High explosive fragmentation tracer (HEF-T)
- High explosive high capacity (HE-M)
- Penetrator with enhanced lateral effect (PELE)
- Target practice - inert projectile (i.e., PGU-27A/B)[1] Used for training (TP)
- Target practice tracer - inert projectile with tracer material in base for visual trajectory tracking (i.e., PGU-30A/B) (TP-T)
20 mm weapons
Each weapon is listed with its cartridge type appended.
Current weapons
Weapon | Country of origin | Cartridge | Notes |
---|---|---|---|
Neopup PAW-20 | ![]() |
20×42mm | |
Denel NTW-20 | ![]() |
20×82mm Mauser | |
Denel Vektor GA-1 | ![]() |
||
Vidhwansak | ![]() |
||
Anzio 20 mm rifle | ![]() |
20×102mm | |
M61 Vulcan | ![]() |
||
M197 electric cannon | ![]() |
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M39 cannon | ![]() |
||
GIAT M621 | ![]() |
||
ZVI PL-20 Plamen | ![]() |
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Nexter Narwhal 20A | ![]() |
Based on the M621 | |
Şahi 20-102 | ![]() |
[2] | |
Metallic RT-20 | ![]() |
20×110mm Hispano | |
Yugoimport-SDPR M71/08 | ![]() |
Single barrel development of Zastava M55 | |
Oerlikon KAA/KAB | ![]() |
20×128mm | Formerly known as Oerlikon 204GK/5TG |
Meroka CIWS | ![]() |
||
Oerlikon KAD | ![]() |
20×139mm | Formerly known as Hispano-Suiza HS.820 |
GIAT M693/20 mm modèle F2 | ![]() |
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Rheinmetall Rh 202 | ![]() |
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Denel Land Systems GI-2 | ![]() |
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Nexter Narwhal 20B | ![]() |
Based on the 20mm F2 |
Historical weapons
Cartridge type indicates the diameter of projectile and the length of the cartridge that holds it; for example 20×102mm is a 20 mm projectile in a 102 mm long case. Only rarely do two designers use the same case length, so this designation is usually definitive. Some cartridge types have additional letters or information about them listed. A B following the case length such as the 20X138B, indicates the cartridge has a belt which is used for headspacing. An R indicates a rimmed cartridge such as the 20X145R. An RB indicates a rebated rim, one which is a smaller diameter than the case head such as the Oerlikon 20X110RB.
See also
References
- ^ PGU-27A/B TP/ PGU-28A/B SAPHEI / PGU-30A/B TP-T
- ^ "Otomatik Orta Kalibre Top". 17 October 2022. Retrieved 17 October 2022.
- ^ Williams, Anthony G (January 4, 2021). "Ammunition Data Tables - 20 mm Calibre Cartridges". Military Guns & Ammunition. Solo Publications. Archived from the original on March 30, 2022. Retrieved April 17, 2022.
External links
- FAS: 20 mm Cannon Ammunition
- ATK produced 20, 25 & 30 mm caliber ammunition
- Rapid Fire: 20 mm Cartridge Data Table
- Rapid Fire: 20 mm Antitank Rifle Cartridges image
- Rapid Fire: 20 mm Autocannon Cartridges WWII image 1
- Rapid Fire: 20 mm Autocannon Cartridges WWII image 2
- Rapid Fire: 20 mm Autocannon Cartridges Post-WWII image