The 13.2 × 92 mm SR, also known as Mauser 13.2 mm TuF (German: Tank und Flieger; literally "tank and aircraft", historical military designation), is a semi-rimmed rifle and machine gun cartridge developed by the German Empire for anti-tank and anti-aircraft use which was introduced during World War I.

The 13.2 mm Tuf was designed to counter early British tanks which made their appearance during late World War I.

Light artillery pieces pressed into service as anti-tank guns were very effective, but cumbersome and difficult to bring into action quickly enough.

Since early plate armor was relatively thin due to the need to reduce vehicle weight for low-powered drive trains to propel the unit (and since tanks were mainly designed to protect from machine-gun fire), large-bore rifles could be used to harass and kill tank crews.

[2] When word of the German anti-tank round spread, there was some debate amongst Allied militaries as to whether it should be copied and used as the basis for a new machine gun cartridge.