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Solothurn S-18/100 20 mm Anti-Tank Cannon
Bundesarchiv Bild 101I-189-1250-10, Russland-Süd, Soldat mit Panzerbüchse.jpg
Type Large caliber rifle, Anti-materiel rifle
Place of origin  Nazi Germany
Service history
Used by  Finland
 Nazi Germany
 Kingdom of Hungary (1920–46)
 Kingdom of Italy
 Kingdom of Bulgaria[1]
Wars Slovak-Hungarian War, World War II
Production history
Variants Solothurn S-18/1000, Solothurn S-18/1100, Solothurn-Arsenal
Weight 45 kg without magazine
Length 1760 mm
Barrel length 925 mm

Cartridge 20×105 mm B
Caliber 20 mm
Action semi-automatic
Muzzle velocity 735 m/s with a Hungarian APHE-T round
Feed system 10 rounds box magazine

The Solothurn S-18/100 20 mm Anti-Tank Cannon was a Swiss and German anti-tank rifle used during the Second World War. It had a semi-automatic action in a bullpup configuration. As a result of its large, powerful ammunition, the gun had a tremendous recoil, and its size made portability difficult. The feed was either from a five or (more usually) ten-round magazine that was attached horizontally to the left side of the gun. The gun used 20×105mm belted-case ammunition which it shared with the S 18-350 aircraft cannon that was developed from the rifle. A Finnish source gives armour penetration of the gun (probably achieved with the Hungarian APHE-T round, since it was the only type used in Finland) as 20mm at a 60-degree angle at 100-metre distance, decreasing to 16mm at 500 metres.

A variant of this design, the Solothurn-Arsenal, was manufactured without license in Estonia before WW2, however only ten were produced prior to Soviet occupation.

In March 1940, with funds collected in Switzerland to help the Finnish war effort in the Winter War, Finland bought twelve S 18-154 anti-tank rifles from Solothurn, though the purchaser was nominally the Swiss army. The weapons arrived into Finland during the spring after the war had ended, but they were later used in the Continuation War. However, the guns were soon found to be obsolete in their intended role. Various models of the S-18 series, including the Solothurn S-18/1000 and the Solothurn S-18/1100 were also used by Switzerland, Hungary, Germany, Italy, and the Netherlands.

The Solothurn firearms company was owned by the German firm Rheinmetall, and used the Swiss company to manufacture arms which were prohibited for manufacture by any German firm, to get around arms limitations imposed upon them at the end of the First World War.

See also



  • Pitkänen, Mika & Simpanen, Timo. 20 mm Suomessa - Aseet ja ampumatarvikkeet ennen vuotta 1945
    20 mm in Finland - Weapons and Ammunition prior to 1945. Apali, 2007. ISBN 978-952-5026-59-7

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