# 2 cm KwK 30

The 2 cm KwK 30 L/55 (2 cm Kampfwagenkanone 30 L/55) was a German 2 cm cannon used as the main armament of the German Sd.Kfz.121 Panzerkampfwagen II light tank and various reconnaissance vehicles. It was used during the Spanish Civil War and the Second World War. It was produced by Mauser and Rheinmetall-Borsig from 1935.
The KwK 30 also served as the basis for the 20 mm C/30, an aircraft variant mounted experimentally in some Heinkel He 112 fighters and proved to make an excellent ground-attack weapon during the Spanish Civil War. Direct ground-attack was not considered a priority for the Luftwaffe and thus, the cannon was not used on other designs.
An improved version, the 2 cm KwK 38 L/55 (2 cm Kampfwagenkanone 38 L/55), was used on the Sd.Kfz.121 Panzerkampfwagen II (Ausf. J models onward). It was also used on the Sd.Kfz.251/17 Schützenpanzerwagen (2 cm) anti-aircraft vehicle, which had the gun on a pedestal mounting with a small armored turret to protect the gunner. Late war, it was issued as a platoon commander's vehicle to replace the Sd.Kfz.251/10 Schützenpanzerwagen (3.7 cm PaK).

## Ammunition

The 2 cm KwK 30 used the 20 x 138B cartridge. Average penetration performance established against rolled homogenous steel armor plate laid back at 30° from the vertical.
* PzGr.39 (Armour Piercing) (Armor penetration: 23 mm at 100 meters and 14 mm at 500 meters)
* PzGr.40 (Armour Piercing Composite Rigid) (Armor penetration: 40 mm at 100 meters and 20 mm at 500 meters)
* 2 cm Sprgr. 39 (High Explosive)
| German designation | US Abbreviation | Projectile weight [g] | Bursting charge | Muzzle velocity [m/s] | Description |
| Sprenggranatpatrone L'spur mit Zerleger | HEF-T | 115 | 6.2 g HE (PETN + wax) | 888 m/s | Nose fuzed tracer round, self-destruct after 5.5 - 6.5 seconds (2000m range) due to tracer burn-through. |
| Sprenggranatpatrone L'spur W mit Zerleger | HEF-T | 120 | 6.2 g HE (PETN + wax) | ? | Nose fuzed tracer round with heat transfer. Self-destruct after 5.5 - 6.5 seconds (2000m range) due to tracer burn-through. |
| Sprenggranatpatrone L'spur mit Zerleger | HEF-T | 120 | 6.6 g HE (PETN + wax) | ? | Boat-tailed HE-Frag. tracer round with nose fuze. Self-destruct at 2000m range due to tracer burn-through. |
| Sprenggranatpatrone 39 Erd | HEF (M) | 132 | 11 g HE ? | 995 m/s | HE-Frag. round with nose fuze, no tracer. |
| Brandsprenggranatpatrone L'spur (Flak) mit Zerleger | HEI (m)-T | 120-122 | 2.4 g HE (PETN) + 4.1 g incendiary (Aluminium) | 900 m/s | Nose fuze, tracer, with self-destruct after 5.5 - 6.5 seconds (2000m range) due to tracer burn-through. |
| Brandsprenggranatpatrone ohne L'spur (Flak) mit Zerleger | HEI (M) | 115-120 | 22 g total 20 g HE Hexogen 5 (RDX + wax) + 2 g incendiary (Zinc) powder | 900 m/s | Nose fuze, no tracer, self-destruct after 5.5 - 8 seconds flight (2000m range). Lack of tracer and high density of incendiary allows heavy filling load. |
| Brandsprenggranatpatrone vk. L'spur W mit Zerleger | HEI (M)-T | 132 | 19 g HE ? + ? g incendiary (WP) | 995 m/s | Nose fuzed HEI tracer round with heat transfer. Self-destruct after 5.5 second (2000m range) due to tracer burn-through. |
| Brandsprenggranatpatrone mit Zerleger? | HEI (m) | 100 | ? g HE ? + ? g incendiary (WP) | 1050 m/s | Nose fuze, no tracer, with self-destruct? |
| Brandsprenggranatpatrone L'spur mit Zerleger? | HEI (m)-T | 100 | ? g HE ? + ? g incendiary (WP) | 1050 m/s | Nose fuze, tracer, with self-destruct? after ? second (?m range) due to tracer burn-through. |
| Panzergranatpatrone L'spur mit Zerleger | APHEI-T | 146 | 2.4 g (PETN) + ? g incendiary (WP) | 830 m/s | Base-fuzed tracer round, with self-destruct due to tracer burn-through after 4.5 second flight (1800m range). |
| Panzergranatpatrone 39 | AP | 148 | w/o filling | 780 m/s | No fuze, no tracer or self-destruct function. |
| Panzergranatpatrone 40 L'spur | APIHC-T APICR-T HVAPI-T | 100 | Light metal shell, special steel core | 1050 m/s | Tungsten carbide core. Tracer round, with no fuze or self-destruct function. Tracer burn-through after 0,9 second flight (600m range). Penetrating effect with incendiary effect due to melting of light metal tip. |
| Panzerbrandgranatpatrone (Phosphor) L'spur ohne Zerleger | API-T | 148 | 3.0 g incendiary (WP) | 780 m/s | Tracer round, with no fuze or self-destruct function. Tracer burn-through after 1,8 second flight (1000m range). |
| Panzergranatpatrone L'spur ohne Zerleger | AP-T | 143 | w/o filling | 800 m/s | Tracer round, with no fuze or self-destruct function. Tracer burn-through after 1,8 second flight (1000m range). |
| Panzersprenggranatpatrone L'spur mit Zerleger (Kriegsmarine) | APHE-T | 121 | 3.6 g HE ? | ? | Base-fuzed round, self-destruct after 4.5 second flight (1800m range) due to tracer burn-through. |

## Vehicles mounted on

* Bergepanther Sd.Kfz.179
* Sd.Kfz.121 Panzerkampfwagen II
* Panzer II Luchs (KwK 38)
* Sd.Kfz.222 Leichter Panzerspähwagen
* Sd.Kfz.231 Schwerer Panzerspähwagen
* Sd.Kfz.232 Schwerer Panzerspähwagen
* Sd.Kfz.234/1
* Sd.Kfz.251/17 Schützenpanzerwagen (2 cm)