2.8 cm sPzB 41

2.8 cm schwere Panzerbüchse 41

sPzB 41 (foreground) at the Canadian War Museum in Ottawa
Type Anti-tank gun
Place of origin Nazi Germany
Service history
In service 1941–1945
Used by Nazi Germany
Wars World War II
Production history
Designed 1940
Manufacturer Mauser-Werke AG
Produced 1940–1943
Number built 2,797
Weight 229 kg (505 lbs)
Length 2.69 m (8 ft 10 in)
Barrel length overall:1.73 m (5 ft 8 in) (with muzzle brake)
Width 96.5 cm (3 ft 2 in)
Height 83.8 cm (2 ft 9 in)
Crew 3

Caliber 28/20 mm (1.10/.78 in)
Breech horizontal block
Recoil hydrospring
Carriage split trail
Elevation -5° to 30°
Traverse 70°
Rate of fire up to 30 rpm
Muzzle velocity 4,500 feet per second (1,400 m/s)[1]
Effective firing range 500 m (547 yds)

2.8 cm schwere Panzerbüchse 41 (sPzB 41) or "Panzerbüchse 41" was a German anti-tank weapon working on the squeeze bore principle. Officially classified as a heavy anti-tank rifle (German: schwere Panzerbüchse), it would be better described, and is widely referred to, as a light anti-tank gun.[2]


Although the sPzB 41 was classified as a heavy anti-tank rifle, its construction was much more typical of an anti-tank gun. Like the latter, it had a recoil mechanism, carriage and shield. The only significant feature the weapon had in common with anti-tank rifles was a lack of elevation and traverse mechanisms—the light barrel could be easily manipulated manually.

The design was based on a tapering barrel, with the caliber reducing from 28 mm at the chamber end to only 20 mm at the muzzle. The projectile carried two external flanges; as it proceeded toward the muzzle, the flanges were squeezed down, decreasing the diameter with the result that pressure did not drop off as quickly and the projectile was propelled to a higher velocity. The barrel construction resulted in a very high muzzle velocity - up to 1,400 m/s. The bore was fitted with a muzzle brake. The horizontal sliding breech block was "quarter-automatic": it closed automatically once a shell was loaded. The gun was equipped with an open sight for distances up to 500m; a telescopic sight, (ZF 1х11 from the 3.7 cm Pak 36 anti-tank gun), could also be fitted.

The recoil system consisted of a hydraulic recoil buffer and spring-driven recuperator. The carriage was of the split trail type, with suspension. Wheels with rubber tires could be removed, making the gun significantly lower and therefore easier to conceal; the process took 30–40 seconds. The guns' construction allowed toolless dismantling to five pieces, the heaviest of which weighed 62 kg.

Development and production history

A British soldier examines a captured sPzB 41 anti-tank gun, Sicily, 1943
sPzB 41 captured by the British Army, 1942

The cone-bore principle was first patented in 1903 by a German designer, Karl Puff. In the 1920s and 1930s, another German engineer, Gerlich, conducted experiments with coned-bore barrels that resulted in an experimental 7 mm anti-tank rifle with a muzzle velocity of 1,800 m/s.

Based on these works, Mauser-Werke AG developed a 28/20 mm anti-tank weapon initially designated Gerät 231 or MK.8202 in 1939–1940. In June–July 1940, an experimental batch of 94 (other sources say 30) pieces was given to the army for trials. They resulted in some modifications and in 1941 mass production of what became 2.8 cm schwere Panzerbüchse 41 started. One piece cost 4,520 Reichsmarks (for the sake of comparison, one 5 cm Pak 38 gun cost 10,600 Reichsmarks). The last gun was built in 1943; the main reason for the discontinuance was the lack of tungsten for projectiles.

Production of sPzB 41, pcs.[3]
1940 1941 1942 1943 Total
94 349 1030 1324 2797
Production of ammunition for sPzB 41, thousands.[3]
Shell type 1940 1941 1942 1943 Total
Fragmentation - 9.2 373.3 130.1 512.6
Armour-piercing 156.2 889.5 270.0 278.1 1602.8

Organization and employment

The sPzB 41 was used by some motorized divisions and by some Jäger (light infantry), Gebirgsjäger (mountain) and Fallschirmjäger (paratrooper) units. Some guns were supplied to anti-tank and sapper units.[4] The weapon was employed on the Eastern Front from the beginning of hostilities (the Wehrmacht possessed 183 pieces on 1 June), until the end of the war and also saw combat in the North African Campaign and on the Western Front in 1944–45.


2.8 cm sPzB 41 le Fl 41, France, 1942

Self-propelled mounts

The sPzb 41 was also mounted on several vehicles, such as cars, half-tracks and armored cars:

Sd.Kfz. 250/11 of Großdeutschland Division, Eastern Front, 1943


Squeeze bore guns saw only limited use in World War II. Manufacturing such weapons was impossible without advanced technologies and high production standards. Besides Germany, the only country to bring such weapons to mass production was Britain, with the Littlejohn adaptor which, although not a gun in itself, used the same principle. An attempt by a Soviet design bureau headed by V. G. Grabin in 1940, failed because of technological problems.[3] In the US, reports about the sPzB 41 inspired a series of experiments with 28/20 barrels and taper bore adaptors for the 37 mm Gun M3; the work started in September 1941 and continued throughout the war, with no practical success.[6]

The sPzB 41 combined good anti-armor performance at short range (for example, at least once a shot penetrated the lower front plate of the heavy JS-1[7]) and a high rate of fire with small, lightweight (for anti-tank gun), dismantleable construction. However, it also had several shortcomings, such as:

Some authors that criticize the sPzB 41 concentrate mainly on the short service life of its barrel. However, its chance of survival after 500 short-range shots was slim anyway. It should also be noted that high-velocity guns with "normal" barrel construction also had a short service life, e.g. for the Soviet 57-mm ZiS-2 it was about 1,000 shots. In the end, the factor that brought production of the sPzB 41 to a halt was the shortage of tungsten.


There were two shell types for the sPzB 41: the armor-piercing 2.8 cm Pzgr.41 and the fragmentation 2.8 cm Sprg.41.

The Pzgr.41 had a tungsten carbide core, a softer steel casing and a magnesium alloy ballistic cap. The core was 40 mm long and 10.9 mm in diameter and contained about 9.1% of tungsten.

Available ammunition[3]
Type Model Weight, kg Filler Muzzle velocity, m/s Range, m
APCNR-T 2.8 cm Pzgr.41 0.125 - 1,430 500
Fragmentation 2.8 cm Sprg.41 0.093 5 g, phlegmatized PETN 1,400 1,000
Armour penetration table
APCNR-T projectile 2.8 cm Pzgr.41
Distance, m Meet angle 60°, mm Meet angle 90°, mm
100 52[3] – 69[8] 75[4]
300 46[3]
400 40[4]
500 40[3] – 52[8]


  1. Johnson, Melvin M., Jr. (1944). Rifles and Machine Guns. William Morrow and Company. p. 385.
  2. E.g. US War Department Intelligence Bulletin, Nov. 1944
  3. 1 2 3 4 5 6 7 Shirokorad A. B. The God of War of the Third Reich.
  4. 1 2 3 Ivanov A. Artillery of Germany in Second World War.
  5. 1 2 3 4 5 "2,8 cm sPzB 41 Gyártás és önjáró változatai". Fritzwaffen. Retrieved 2012-07-28.
  6. Zaloga, Delf. US Anti-tank Artillery 1941–45, p 6–7.
  7. Potapov, Valeri. "JS-1 and JS-2 Heavy Tanks". The Russian Battlefield. Retrieved 31 October 2014.
  8. 1 2 Guns vs Armour, from Hogg, Ian V. German Artillery of World War Two.


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