| 3.7 cm Flak 43 | |
|---|---|
 A Flak 43 Zwilling in Northern France, mid-1944 | |
| Type | Anti-aircraft gun |
| Place of origin | Nazi Germany |
| Service history | |
| In service | 1944-1945 |
| Used by | Germany |
| Wars | World War II |
| Production history | |
| Designer | Rheinmetal-Borsig |
| Designed | 1939–1943 |
| Produced | 1944–1945 |
| Specifications | |
| Mass | 355 kg (783 lb) |
| Barrel length | 2.106 m (82.9 in) (57 calibers) |
| Crew | 3–4 |
| Shell | 37 × 263B |
| Shell weight | 635–700 g (1.4–1.5 lb) |
| Caliber | 37 mm (1.5 in) |
| Breech | Gas-operated |
| Elevation | -10° to +90° |
| Traverse | 360° |
| Rate of fire |
|
| Muzzle velocity | 790–820 m/s (2,600–2,700 ft/s) |
| Effective firing range |
|
| Feed system | 8-round clips |
The 3.7 cm Flak 43 was a light anti-aircraft (AA) gun used by Nazi Germany during World War II. It was derived from the 3.7-centimeter (1.5 in) Flak 18/36/37 series of AA guns. It was provided with single- and twin-gun mounts, the latter being designated as the 3.7 cm Flak 43 Zwilling and was in service from 1944 to 1945. In addition to versions used by the Kriegsmarine (German Navy), it served as the main armament of the Ostwind and Möbelwagen and was proposed for use in the Flakpanzer Coelian self-propelled AA guns.