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{{Infobox weapon
{{Infobox weapon
|name=Bofors 25 mm M/32
|name=Bofors 25 mm M/32
| image=Bofors 25 mm akan.jpeg
|image=Bofors 25 mm akan.jpeg
| image_size=300
|image_size=300
|caption=Bofors 25 mm automatic cannon M/32 on a Swedish submarine.
|caption=Bofors 25 mm automatic cannon M/32 on a Swedish submarine.
|origin=[[Sweden]]
|origin=Sweden
|type=[[Anti-aircraft gun]]
|type=[[Anti-aircraft gun]]
<!-- Type selection -->
<!-- Type selection -->
Line 23: Line 23:
|production_date=1932–1945
|production_date=1932–1945
|number=
|number=
|variants=M/38 25 x 187 mm R<ref name=":0">{{Cite web|url=http://www.quarryhs.co.uk/ammotable3.html|title=21-29 MM CALIBRE CARTRIDGES|website=www.quarryhs.co.uk|access-date=2017-09-20}}</ref>
|variants=M/38 25×187 mm R<ref name=":0">{{Cite web|url=http://www.quarryhs.co.uk/ammotable3.html|title=21-29 MM CALIBRE CARTRIDGES|website=www.quarryhs.co.uk|access-date=2017-09-20|archive-date=2019-04-07|archive-url=https://web.archive.org/web/20190407134003/http://www.quarryhs.co.uk/ammotable3.html|url-status=dead}}</ref>
<!-- General specifications -->
<!-- General specifications -->
|weight=Single: {{convert|570|kg|lb|abbr=on}}<br>Twin: {{convert|1100|kg|lb|abbr=on}}
|weight=Single: {{convert|570|kg|lb|abbr=on}}<br>Twin: {{convert|1100|kg|lb|abbr=on}}
|length=
|length=
|part_length={{convert|1.6|m|ftin|abbr=on}} L/64<ref name=":1">{{Cite web|url=http://www.quarryhs.co.uk/Bofors.htm|title=BOFORS AUTOMATIC CANNON|website=www.quarryhs.co.uk|access-date=2017-09-20}}</ref>
|part_length={{convert|1.6|m|ftin|abbr=on}} L/64<ref name=":1">{{Cite web|url=http://www.quarryhs.co.uk/Bofors.htm|title=BOFORS AUTOMATIC CANNON|website=www.quarryhs.co.uk|access-date=2017-09-20|archive-date=2012-12-28|archive-url=https://web.archive.org/web/20121228005723/http://www.quarry.nildram.co.uk/Bofors.htm|url-status=dead}}</ref>
|width=
|width=
|height=
|height=
|crew=
|crew=
<!-- Ranged weapon specifications -->
<!-- Ranged weapon specifications -->
|cartridge=[[Glossary of British ordnance terms#Fixed QF|Fixed QF]] 25 x 205 mm R
|cartridge=[[Glossary of British ordnance terms#Fixed QF|Fixed QF]] 25×205 mm R
|cartridge_weight={{convert|.25|kg|lboz|abbr=on}}
|cartridge_weight={{convert|.25|kg|lboz|abbr=on}}
|caliber={{convert|25|mm|in|abbr=on}}<ref name=":0" />
|caliber={{convert|25|mm|in|abbr=on}}<ref name=":0" />
|action=Long-recoil
|action=Long-recoil
|rate=120 rpm
|rate=160 rpm
|velocity={{convert|850|m/s|ft/s|abbr=on}}
|velocity={{convert|850|m/s|ft/s|abbr=on}}
|range={{convert|3.5|km|ft|abbr=on}} AA ceiling
|range={{convert|3.5|km|ft|abbr=on}} AA ceiling
|max_range={{convert|5.6|km|ft|abbr=on}} Horizontal range<ref>{{Cite web|url=http://www.navypedia.org/arms/sweden/sw_guns.htm|title=Swedish guns|website=www.navypedia.org|access-date=2017-09-20}}</ref>
|max_range={{convert|5.6|km|ft|abbr=on}} Horizontal range
|feed=6 round clips
|feed=6-round clips
|sights=
|sights=
<!-- Artillery specifications -->
<!-- Artillery specifications -->
|breech=
|breech=
|recoil=Hydro-spring
|recoil=[[Glossary of British ordnance terms#Hydro-spring|Hydro-spring]]
|carriage=Single or twin fixed pedestal mounts<ref name=":1" />
|carriage=Single or twin fixed pedestal mounts<ref name=":1" />
|elevation=-5° to 90°
|elevation=−5° to 90°
|traverse=360°
|traverse=360°
<!-- Explosive specifications -->
<!-- Explosive specifications -->
Line 56: Line 56:
}}
}}


The '''Bofors 25 mm M/32''' was a Swedish designed and built light [[anti-aircraft gun]] that was used aboard ships of the [[Swedish Navy]] during the [[Second World War]].
The '''Bofors 25&nbsp;mm M/32''' was a Swedish- designed and built light [[anti-aircraft gun]] that was used aboard ships of the [[Swedish Navy]] during the [[Second World War]].


==History==
==History==
The development of [[Bofors]] first automatic weapons began in 1925 when the Navy requested the development of a 20 mm [[Anti-aircraft warfare|anti-aircraft gun]]. In 1928 the Navy requested a new [[Bofors 40 mm gun|40mm AA gun]] and a 25 mm AA gun which was produced in parallel and known as the M/32.<ref name=":1" />
The development of [[Bofors]] first automatic weapons began in 1925 when the Navy requested the development of a 20&nbsp;mm [[Anti-aircraft warfare|anti-aircraft gun]]. In 1928 the Navy requested a new [[Bofors 40 mm Automatic Gun L/60|40 mm AA gun]] and a 25&nbsp;mm AA gun which was produced in parallel and known as the M/32.<ref name=":1" />


==Design==
==Design==
[[File:Anti aircraft gun on HMS Gävle.jpg|thumb|left|A twin M/32 mount aboard HSwMS ''Gävle'']]
The M/32 was designed with a barrel 64 [[Caliber (artillery)|calibers]] in length, fired a 25 x 205 mm R cartridge, at 160-180 rpm and with a muzzle velocity of 850 m/s. Later a shorter version firing a 25 x 187 mm R cartridge was produced in limited numbers. The M/32 looked similar to its larger 40 mm sibling and used the same [[Recoil operation|long-recoil]] operating system and [[hydro-spring]] recoil mechanism. Its feed mechanism consisted of 6-round clips which were held in a vertical frame above the gun breech. Two clips were mounted side by side so that continuous fire could be maintained without the need to pause and change magazines. The clips were in two halves, which split and fell away as the cartridges entered the frames.<ref name=":1" />
The M/32 was designed with a barrel 64 [[Caliber (artillery)|calibers]] in length, fired a 25×205mmR cartridge, at 160–180 rpm and with a muzzle velocity of 850&nbsp;m/s. Later a shorter version firing a 25×187mmR cartridge was produced in limited numbers. The M/32 looked similar to its larger 40&nbsp;mm sibling and used the same [[Recoil operation|long-recoil]] operating system and [[hydro-spring]] recoil mechanism. Its feed mechanism consisted of 6-round clips which were held in a vertical frame above the gun breech. Two clips were mounted side by side so that continuous fire could be maintained without the need to pause and change magazines. The clips were in two halves, which split and fell away as the cartridges entered the frames.<ref name=":1" />


The gun was available in fixed single mount, fixed twin mount or on a mobile four-wheeled carriage with twin collapsible outriggers. In addition to fixed pedestal mounts, a [[Disappearing gun|retractable gun]] mount was designed for submarine use. Although available in land mounts it was primarily a naval weapon. At first the 40 mm gun was considered to be too heavy, so early preference was given to single and twin mounts of the M/32 aboard ships of the Swedish navy.<ref name=":1" />
The gun was available in fixed single mount, fixed twin mount or on a mobile four-wheeled carriage with twin collapsible [[Gun carriage#Modern gun carriages|outriggers]]. In addition to fixed pedestal mounts, a [[Disappearing gun|retractable gun]] mount was designed for submarine use. Although available in land mounts it was primarily a naval weapon. At first the 40&nbsp;mm gun was considered to be too heavy, so preference was given to single and twin mounts of the M/32 aboard ships of the Swedish navy.<ref name=":1" />

==Gallery==
<gallery widths="175" mode="nolines">
File:AA gun on HMS Malmö.jpg|A single M/32 mount aboard HSwMS ''Malmö''
File:Old artillery at Vaxholms kastell (19829783670).jpg|A single M/32 mount at [[Vaxholm Fortress]], Sweden.
File:Bofors 25 mm gun at Vaxholm Castle.jpg|A twin M/32 at Vaxholm Fortress, Sweden.
File:Automatic gun - Bofors -1932 - Vaxholm Castle.jpg|A twin M/32 at Vaxholm Fortress, Sweden.
</gallery>

==See also==
*[[25 mm Hotchkiss anti-aircraft gun]]
*[[25 mm automatic air defense gun M1940 (72-K)]]
*[[Type 96 25 mm AT/AA Gun]]


==Notes==
==Notes==
{{Reflist|20em}}
{{Reflist|20em}}


==External links==
==Bibliography==
* Gander, T 1990, ''The 40mm Bofors Gun'', 2nd edn, Patrick Stephens, Wellingborough, Eng.
* http://www.quarryhs.co.uk/Bofors.htm

* http://www.navypedia.org/arms/sweden/sw_guns.htm
==External links==
* http://www.quarryhs.co.uk/ammotable3.html
* http://www.quarryhs.co.uk/Bofors.htm {{Webarchive|url=https://web.archive.org/web/20121228005723/http://www.quarry.nildram.co.uk/Bofors.htm |date=2012-12-28 }}
* http://www.quarryhs.co.uk/ammotable3.html {{Webarchive|url=https://web.archive.org/web/20190407134003/http://www.quarryhs.co.uk/ammotable3.html |date=2019-04-07 }}

{{Weapons made in Sweden 1914–1945|style=wide}}


{{DEFAULTSORT:Bofors 25 mm M/32}}
{{DEFAULTSORT:Bofors 25 mm M/32}}
[[Category:25 mm artillery]]
[[Category:25 mm artillery]]
[[Category:Anti-aircraft guns]]
[[Category:World War II anti-aircraft guns]]
[[Category:World War II anti-aircraft guns]]
[[Category:Naval guns of Sweden]]
[[Category:Naval guns of Sweden]]
[[Category:World War II naval weapons]]
[[Category:World War II naval weapons]]
[[Category:Artillery of Sweden]]
[[Category:Anti-aircraft guns of Sweden]]
[[Category:Bofors]]
[[Category:Bofors]]
[[Category:Autocannon]]
[[Category:Autocannon]]

Latest revision as of 10:32, 21 March 2024

Bofors 25 mm M/32
Bofors 25 mm automatic cannon M/32 on a Swedish submarine.
TypeAnti-aircraft gun
Place of originSweden
Service history
Used bySweden
WarsWorld War II
Production history
DesignerBofors
Designed1932
ManufacturerBofors
Produced1932–1945
VariantsM/38 25×187 mm R[1]
Specifications
MassSingle: 570 kg (1,260 lb)
Twin: 1,100 kg (2,400 lb)
Barrel length1.6 m (5 ft 3 in) L/64[2]
ShellFixed QF 25×205 mm R
Shell weight.25 kg (8.8 oz)
Caliber25 mm (0.98 in)[1]
ActionLong-recoil
RecoilHydro-spring
CarriageSingle or twin fixed pedestal mounts[2]
Elevation−5° to 90°
Traverse360°
Rate of fire160 rpm
Muzzle velocity850 m/s (2,800 ft/s)
Effective firing range3.5 km (11,000 ft) AA ceiling
Maximum firing range5.6 km (18,000 ft) Horizontal range
Feed system6-round clips

The Bofors 25 mm M/32 was a Swedish- designed and built light anti-aircraft gun that was used aboard ships of the Swedish Navy during the Second World War.

History[edit]

The development of Bofors first automatic weapons began in 1925 when the Navy requested the development of a 20 mm anti-aircraft gun. In 1928 the Navy requested a new 40 mm AA gun and a 25 mm AA gun which was produced in parallel and known as the M/32.[2]

Design[edit]

A twin M/32 mount aboard HSwMS Gävle

The M/32 was designed with a barrel 64 calibers in length, fired a 25×205mmR cartridge, at 160–180 rpm and with a muzzle velocity of 850 m/s. Later a shorter version firing a 25×187mmR cartridge was produced in limited numbers. The M/32 looked similar to its larger 40 mm sibling and used the same long-recoil operating system and hydro-spring recoil mechanism. Its feed mechanism consisted of 6-round clips which were held in a vertical frame above the gun breech. Two clips were mounted side by side so that continuous fire could be maintained without the need to pause and change magazines. The clips were in two halves, which split and fell away as the cartridges entered the frames.[2]

The gun was available in fixed single mount, fixed twin mount or on a mobile four-wheeled carriage with twin collapsible outriggers. In addition to fixed pedestal mounts, a retractable gun mount was designed for submarine use. Although available in land mounts it was primarily a naval weapon. At first the 40 mm gun was considered to be too heavy, so preference was given to single and twin mounts of the M/32 aboard ships of the Swedish navy.[2]

Gallery[edit]

  • A single M/32 mount aboard HSwMS Malmö
    A single M/32 mount aboard HSwMS Malmö
  • A single M/32 mount at Vaxholm Fortress, Sweden.
    A single M/32 mount at Vaxholm Fortress, Sweden.
  • A twin M/32 at Vaxholm Fortress, Sweden.
    A twin M/32 at Vaxholm Fortress, Sweden.
  • A twin M/32 at Vaxholm Fortress, Sweden.
    A twin M/32 at Vaxholm Fortress, Sweden.

See also[edit]

Notes[edit]

  1. ^ a b "21-29 MM CALIBRE CARTRIDGES". www.quarryhs.co.uk. Archived from the original on 2019-04-07. Retrieved 2017-09-20.
  2. ^ a b c d e "BOFORS AUTOMATIC CANNON". www.quarryhs.co.uk. Archived from the original on 2012-12-28. Retrieved 2017-09-20.

Bibliography[edit]

  • Gander, T 1990, The 40mm Bofors Gun, 2nd edn, Patrick Stephens, Wellingborough, Eng.

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Bofors_25_mm_M/32&oldid=1214816008"