Bofors 37 mm anti-tank gun

Bofors 37 mm anti-tank gun
Polish wz.36 anti-tank gun.
Type	Anti-tank gun
Place of origin	Sweden
Service history
Used by	See Operators
Production history
Designed	1934
Manufacturer	Bofors
Produced	1935 –
Specifications
Mass	370 kg (816 lbs)
Length	3.04 m (10.0 ft)
Barrel length	1.6 m (5 ft 3 in) 45 calibers
Width	1.09 m (3 ft 7 in)
Height	1.03 m (3 ft 5 in)

Shell	Fixed QF 37×258 mm R
Shell weight	.74 kg (1 lb 10 oz)^[1]
Caliber	37 mm (1.45 in)
Breech	vertical sliding-block
Carriage	split trail
Elevation	-10° to 25°
Traverse	50°
Rate of fire	12 rounds per minute
Muzzle velocity	800–870 m/s (2,625-2,854 ft/s)
Effective firing range	4,000 m (4,374 yds)
Maximum firing range	6,500 m (7,108 yds)

The Bofors 37 mm anti-tank gun was an anti-tank gun designed by Swedish manufacturer Bofors in the early 1930s originally for Swedish use. It was exported to several countries during the 1930s of which several bought licences to produce it themselves. The gun was used in several conflicts but most of its fame comes from its use in the Spanish Civil War and the Winter War where it was used very successfully against light tanks and armored cars among other targets. Beyond its use as an infantry gun it was also used as the main armament in several armored cars and tanks such as the Dutch M39 Pantserwagen and the Polish 7TP to name a few. As the armor of tanks was increased during World War II the gun very quickly became obsolete as an anti-tank gun but was still used effectively as an infantry support gun for the entirety of the war, and well into the Cold War. This was due to its high fire rate, great mobility and effective high explosive shells.

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Development history

The gun was initially designed by Swedish manufacturer Bofors, mainly for export purposes. It was likely derived from Rheinmetall's 3,7-cm Tak, the predecessor of 3.7 cm Pak 36.^[2] The first prototype was built in 1932; the development process continued until 1934. The Netherlands were the first to purchase the gun (order for 12 pieces was placed in 1935) and were followed by many other countries. Licensed copies were produced in Denmark, Finland, the Netherlands and Poland.

The barrel was of monobloc type, with semi-automatic vertical sliding breech block and small muzzle brake. It was mounted on a split trail carriage which had suspension and metal wheels with rubber tires. To give the crew some protection from firearms and shell fragments, the gun was equipped with a 5 mm thick shield, with a folding lower plate.

Operational history

The Bofors gun saw combat for the first time in Spanish Civil War, where it could easily pierce the armor of contemporary light tanks. The Polish guns were actively used during the German and Soviet invasion of Poland in 1939. Wołyńska Cavalry Brigade equipped with the Bofors 37 mm antitank gun beat the German Panzer Divisions in one of the first battles of the invasion; the Battle of Mokra. At that time, the armored forces of the Wehrmacht consisted mainly of light Panzer I and Panzer II tanks, which were vulnerable to the Bofors gun. Early models of the Panzer III and Panzer IV could also be penetrated at ranges up to 500 m. After Poland was occupied, most of the guns fell into the hands of the German and Soviet armies. The weapon was proven obsolete by 1941 during Operation Barbarossa.

Even though only one Bofors AT-gun was in action in the invasion of Denmark, it damaged two tanks, and shot the tracks off another tank, before its crew were either wounded or killed by a German tank destroyer which drove over the gun. The gun is now at the Tøjhusmuseet in Copenhagen.

During the Winter War, the Finnish guns were successfully used against Soviet tanks such as T-26, T-28 and BT. However, in the Continuation War the gun was found to be ineffective against the T-34 and KV and was relegated to an infantry support role.

The gun was used to equip the British forces in North Africa, where it made up for the lack of the QF 2-pounder anti-tank guns after the Fall of France. It was often carried portee on the back of a vehicle.

Bofors guns were also employed in World War II by Germany, the Netherlands, Romania, Yugoslavia and USSR, but there are no detailed reports of their use.

Summary

When it was introduced, the Bofors 37 mm anti-tank gun was an effective weapon, able to deal with contemporary tanks. Its performance, light weight and high rate of fire made it a popular anti-tank weapon in the pre-war Europe. Introduction of better armored tanks early in World War II, however, made the gun obsolete (as with other similarly performing weapons such as the German 3.7 cm Pak 36 and the United States 37 mm Gun M3).

Ammunition

There were many different ammunition types available for the Bofors 37 mm at gun. It could fire all common types of ammunition and some rare types such as APDS and white phosphorus incendiary.

Swedish ammunition^[3]^[4]^[5]^[6]
Designation	Type	Projectile			Performance
		Core	Weight	Propellant weight (kg NC 1245)	Power	Muzzle-Vo	Penetration
		Core	Weight	Propellant weight (kg NC 1245)	Power	Muzzle-Vo	@ 0° from normal	Impact-Vo	@ 30° from normal	Impact-Vo	@ 45° from normal	Impact-Vo
37 mm sk ptr m/34 slpprj m/38	AP-T	–	0.735 kg	0.205 kg	330 MPa	785 m/s	55 mm at 200 m – – – –	739 m/s – – – –	45 mm at 200 m 40 mm at 400 m 35 mm at 600 m 32 mm at 800 m 29 mm at 1000 m	739 m/s – – – –	33 mm at 200 m 30 mm at 400 m 27 mm at 600 m 24 mm at 800 m 22 mm at 1000 m	739 m/s – – – –
37 mm sk ptr m/34 slpgr m/39	APHE-T	15 grams of Trotyl	0.740 kg	0.217 kg	280 MPa	775 m/s	- -	- -	39 mm at 100 m 30 mm at 900 m	- –	- –	- –
37 mm sk ptr m/34 slpprj m/49	APDS-T	24 mm dart				1150 m/s	- - - - - -	- - - - - -	70 mm at 0 m 65 mm at 200 m 62 mm at 400 m 58 mm at 600 m 55 mm at 800 m 52 mm at 1000 m	1130 m/s 1100 m/s 1060 m/s 1030 m/s 1000 m/s 970 m/s	- – – – – –	- – – – – –
37 mm sk ptr m/34 sgr m/43	HE	95 grams of Trotyl	0.680 kg	0.210 kg	330 MPa	805 m/s	-	-	-	-	-	-
37 mm sk ptr m/34 slövnprj m/38	P-AP-T	Spotting charge	0.728 kg	0.213 kg	280 MPa	790 m/s	-	-	-	-	-	-
37 mm sk ptr m/34 övngr m/34	P-HE	Spotting charge	0.660 kg	0.220 kg	330 MPa	810 m/s	-	-	-	-	-	-

Operators

Denmark: A version with slightly more powerful cartridge^{[citation needed]} was manufactured by the Danish state arsenal Hærens Vaabenarsenal in 1936-37 as 37 mm fodfolkskanon M. 1934. In 1945 Danish units returning to their homeland brought with them a few Swedish model 1938 guns.
Finland: As 37 PstK/36. 114 pieces were bought from Bofors in 1938–39 (some of them were returned to Sweden in 1940), 42 Polish-made guns were received from Germans in 1940–41 and 355 were produced by local manufacturers Tampella and VTT (Valtion Tykkitehdas – State Artillery Factory) in 1939–41. When the Winter War began in November 1939, the Finnish Army had 98 guns of the type. A tank version was also used to equip Finnish 6-tonne tanks. The gun remained in the Finnish Army inventory listings until 1986.
Germany: Used Polish guns captured in 1939 as 3,7 cm PaK 36(p) and Danish guns captured in 1940 as 3,7 cm PaK 157(d).
Netherlands: 12 pieces were ordered from Bofors in 1935. Later another 24 (or more) were procured. All these were used for Dutch armoured cars: 24 Landsverk types L180 and L181 as well as 12 DAF Pantrado cars.

Poland: As wz.36. 300 guns were bought in Sweden and hundreds more were produced by SMPzA (Stowarzyszenie Mechaników Polskich z Ameryki) in Pruszków, some of them exported. When World War II began, the Polish Army had 1,200 pieces. A tank variant, designated wz.37, was mounted in 7TP (single-turret version), 9TP (prototypes) and 10TP tanks. 111 of them were produced before the war.
Romania: 669 pieces (former Polish ones) were bought from Germany.^[7]
Spanish Republic: Some guns bought by the Republicans were used during the Spanish Civil War.
Sweden: Adopted in 1937 as 37 mm infanterikanon m/34 (infantry gun model 1934). Modernized version was adopted in 1938 as 37 mm pansarvärnskanon m/38 (anti-tank gun model 1938) and 37 mm pansarvärnskanon m/38 F. The latter was also produced in a tank gun variant – 37 mm Kanon m/38 stridsvagn; it was fitted to Landsverk Strv m/38, Strv m/39, Strv m/40 light tanks and to the Strv m/41, a Swedish version of the Czech TNH light tank.
Turkey
United Kingdom: A number of Swedish m/34 ordered by Anglo-Egyptian Sudan were adopted as "Ordnance QF 37 mm Mk I".
Soviet Union: Several dozen Polish guns fell into Soviet hands. Late in 1941 these pieces were issued to Red Army units to make up for the lack of anti-tank guns.
Yugoslavia

Gallery

A Portée mounted Ordnance QF 37 mm Mk I on a 30 cwt Chevrolet WB
Bofors 37 mm ammunition
The pepper pot muzzle brake
A Finnish-made gun at the Manege Military Museum, Suomenlinna fortress, Helsinki, 2006

Notes

^ Chamberlain, Peter (1974). Anti-tank weapons. Gander, Terry. New York: Arco Pub. Co. p. 36. ISBN 0668036079. OCLC 1299755.
^ "Swedo-Polish Tank Killer".
^ 37 mm kan m/38 värntorn skjuttabeller. Swedish army.
^ Pansarkommittén 1944.
^ Arméhögkvarteret försvarets materielverk 1942.
^ Pansartruppskolan, försöksgruppen hemlig 1960, försök mot strv 74 torn.
^ Mark Axworthy, London: Arms and Armour, 1995, Third Axis, Fourth Ally: Romanian Armed Forces in the European War, 1941–1945, p. 30

References

Shirokorad A. B. – The God of War of the Third Reich – M. AST, 2002 (Широкорад А. Б. – Бог войны Третьего рейха. – М.,ООО Издательство АСТ, 2002., ISBN 5-17-015302-3)

External links

Wikimedia Commons has media related to Bofors 37 mm gun.

Bofors AT guns
The Finnish Weapons Series: Bofors 37 mm AT Gun Archived 3 March 2016 at the Wayback Machine
Finnish Army 1918 – 1945, AT Guns: 37 PstK/36 Bofors
Armament of Polish armoured vehicles 1918–39: 37 mm wz.36, wz.37 Archived 1 March 2016 at the Wayback Machine

Weapons and military equipment designed in Sweden 1914–1945

Firearms

Rifles	Automatgevär Model 1942
Submachine guns	Carl Gustaf Model 1945
Machine guns	Kulsprutegevär Browning Model 1921 Carl Gustaf Model 1942 Kulsprutegevär Carl Gustaf Model 1937 Svenska Automatvapen Model 1940

Artillery

Tank and Anti-tank guns	Bofors 37 mm Gun Model 1934 Bofors 57 mm anti-tank gun
Mountain guns	Bofors 75 mm Model 1928 Bofors 75 mm Model 1934
Field, Medium and Heavy guns	Bofors 105 mm Howitzer Model 1924 Bofors 105 mm Howitzer Model 1935 Bofors 105 mm Howitzer Model 1937 Bofors 75 mm Model 1935 Bofors 105 mm Gun Model 1927 Bofors 105 mm Gun Model 1931 Bofors 105 mm Gun Model 1934 Bofors 120 mm Howitzer Model 1914 Bofors 150 mm Howitzer Model 1931
Anti-aircraft guns	Bofors 20 mm Automatic Gun Model 40 Bofors 25 mm Automatic Gun Model 1932 Bofors 40 mm/60 Model 1936 Bofors 75 mm Gun Model 1929
Coastal guns	Bofors 105 mm Gun Model 1927 Bofors 105 mm Gun Model 1934
Naval guns	Bofors 15.2 cm M/12 gun Bofors 152 mm M/39 gun Bofors 283 mm M/12 gun

Armored
Fighting
Vehicles

Light tanks	Strv m/21-29 Landsverk L-10 (Strv m/31) Landsverk L-60 Landsverk L-120
Medium tanks	Landsverk Lago (Strv m/42)
Assault guns	Stormartillerivagn m/43
Self-propelled anti-aircraft guns	Landsverk L-62
Armoured cars	Pansarbil M/31 Landsverk Lynx Landsverk L-180/L-181/L-182 Landsverk L-185
Infantry fighting vehicles	Terrängbil m/42 KP
Artillery tractors	Landsverk L-131 Landsverk L-132 Landsverk L-135
Prototypes	Landsverk L-5 Landsverk L-100 Landsverk L-101

This page was last edited on 13 February 2024, at 21:32

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