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12.8cm Flakzwilling 40

Nazi Germany (1942)
Picture of 12.8cm Flakzwilling 40 Double-Barreled Anti-Aircraft Gun System
Picture of 12.8cm Flakzwilling 40 Double-Barreled Anti-Aircraft Gun System Picture of 12.8cm Flakzwilling 40 Double-Barreled Anti-Aircraft Gun System
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The Flakzwilling 40 was nothing more than a double-barreled version of the successful FlaK 40 anti-aircraft gun system.

Detailing the development and operational history of the 12.8cm Flakzwilling 40 Double-Barreled Anti-Aircraft Gun System.  Entry last updated on 5/21/2018. Authored by JR Potts, AUS 173d AB. Content ©

The double 12.8 cm (128mm) "Flakzwilling 40" was a variant of the very successful 12.8 cm FlaK 40 that was designed to replace the fabled 88mm anti-aircraft gun system that proved doubly effective (and thusly feared) as a tank-killing gun to the Allies. The double-barreled FlaK 40 was a large gun system that needed to be broken down into more relatively compact components if transportation of the unit to a new location was required. As such, engineering efforts were made to use these guns in static positions in and around major strategic cities like Berlin, eliminating the need for their transporting to other positions. Some of the "doubles" were mounted and fixed onto flat railcars to fulfill long-range mission requirements while still others were affixed to flatbed heavy trailers allowing them to be towed by vehicles such as the SdKfz 9 series halftrack. In its heavy trailer form, the platform fielded six solid rubber tires on each side and was further supported by way of a rugged suspension needed to hold the 12 ton gun system.

The Flakzwilling 40 used a horizontal semi-automatic sliding block and was electrically fired each shell after they had entered the breech by way of a powered rammer. The recoil was Hydropneumatic in nature while the elevation reach for the gun barrels was from -3 degrees to a + 88 degrees while traverse was a full 360 degrees. Each 57.2lb shell vertical range was 12.5 miles which made it possible to engage all of the Allied bombers then in use. A full operating crew including an officer (Captain), two gunners and as many as seven ammunition handlers were need to maintain the excellent optimal 12- to 20-rounds per minute firing rate.

Picture of the 12.8cm Flakzwilling 40 Double-Barreled Anti-Aircraft Gun System
Picture of the 12.8cm Flakzwilling 40 Double-Barreled Anti-Aircraft Gun System

Any available statistics for the 12.8cm Flakzwilling 40 Double-Barreled Anti-Aircraft Gun System are showcased in the areas immediately below. Categories include basic specifications covering initial year of service, country-of-origin, manufacturer and total production numbers. Other qualities showcased are related to structural values (namely dimensions), installed power and standard day performance figures, installed armament and ammunition carried, global users (from A-to-Z) and model variants in the series.

Supported Mission Types:
Troop Transport
Infantry Support
High Mobility
Tank Destroyer
Special Forces
Towed Artillery
Self-Propelled Artillery
Rocket Artillery
Airspace Denial
Special Purpose
National Flag Graphic
Origin: Nazi Germany
Year: 1942
Type: Double-Barreled Anti-Aircraft Gun System
Manufacturer(s): Rheinmetall-Borsig - Nazi Germany
Production: 125
Global Operators:
Nazi Germany
Measurements and Weights icon
Structural - Crew, Dimensions, and Operating Weights:
Unless otherwise noted the presented statistics below pertain to the 12.8cm Flakzwilling 40 model. Common measurements, and their respective conversions, are shown when possible.




25.69 ft

7.83 m


9.58 ft

2.92 m


9.84 ft

3 m


Tons (US Short)
12 t

10,886 kg

24,000 lb

Engine icon
Installed Power - Standard Day Performance:
None. This is a towed or static anti-aircraft gun piece.

Maximum Road

12 mi

20 km

Armament and Ammunition:

2 x 12.8cm (128mm) gun barrels

Depedend upon ammunition carrier.
Optional Systems / Capabilities:

Nuclear-Biological-Chemical (NBC) Protection: None.
Nightvision (NV) Equipment: Searchlights.
Variants: Series Model Variants
• Flakzwilling 40 - Base Series Designation