15 cm sIG 33

The 15 cm sIG 33 (schweres Infanterie Geschütz 33) was the standard German heavy infantry gun used in the Second World War. It was the largest weapon ever classified as an infantry gun by any nation. Sources differ on the development history, but the gun itself was of conventional design. Early production models were horse-drawn, with wooden wheels. Later production models had pressed steel wheels, with solid rubber tires and air brakes for motor towing. The sIG 33 was rather heavy for its mission and it was redesigned in the late 1930s to incorporate light alloys in an effort to save weight. This saved about 150 kilograms (330 lb), but the outbreak of war forced the return to the original design before more than a few hundred were made, as the Luftwaffe had a higher priority for light alloys. A new carriage, made entirely of light alloys, was tested around 1939, but was not accepted for service.

15 cm sIG 33
Class Vehicle
Type Towed Artillery
Manufacturer Rheinmetall
Production Period 1927 - 1945
Origin Germany
Country Name Origin Year
Germany 1927
Country Name Operational Year Retirement Year
Germany 1927 1945 View
ManufacturerName Production From Production To Quantity
Rheinmetall 1927 1945 4600 View

Type Heavy infantry gun
Place of origin Weimar Republic
Service history
In service 1927-1945
Used by Nazi Germany
Wars World War II
Production history
Designer Rheinmetall
Designed 1927–33
Manufacturer Rheinmetall, AEG-Fabriken, Bohemisch Waffenfabrik
Produced 1936–1945
Number built around 4,600
Variants sIG 33/1
Weight 1,800 kg (4,000 lb)
Length 4.42 m (14 ft 6 in)
Barrel length 1.65 m (5 ft 5 in) L/11
Width 2.06 m (6 ft 9 in)
Shell cased separate-loading (6 charges)
Caliber 149.1 mm (5.87 in)
Breech horizontal sliding block
Recoil hydropneumatic
Carriage box trail
Elevation 0° to +73° or -4° to +75°
Traverse 11.5°
Rate of fire 2-3 rounds per minute
Muzzle velocity 240 m/s (790 ft/s) (HE)
Effective firing range 4,700 m (5,100 yd)
Sights Rblf36

End notes