20×110mm USN
Cold War-era American autocannon cartridge / From Wikipedia, the free encyclopedia
The 20×110mm USN (also known as 20×110mm US Navy and 20mm Mk-100 Series) is an autocannon cartridge developed by the US Navy after World War II for use in Mk 11 and Mk 12 autocannons. They are called the Mk 100 series as they range from Mk 101 to Mk 109.
Quick Facts Type, Place of origin ...
20×110mm USN | ||||||||
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Type | Autocannon | |||||||
Place of origin | USA | |||||||
Service history | ||||||||
In service | 1950s–present | |||||||
Used by | United States Navy Royal New Zealand Air Force | |||||||
Wars | Vietnam War | |||||||
Production history | ||||||||
Designer | United States Navy | |||||||
Specifications | ||||||||
Case type | Rimless, bottleneck | |||||||
Bullet diameter | 19.9 mm (0.78 in) | |||||||
Neck diameter | 20.6 mm (0.81 in) | |||||||
Base diameter | 29 mm (1.1 in) | |||||||
Rim diameter | 29.5 mm (1.16 in) | |||||||
Case length | 109.5 mm (4.31 in) | |||||||
Overall length | 185 mm (7.3 in) | |||||||
Primer type | Electric | |||||||
Maximum pressure | 600 MPa (87,000 psi) | |||||||
Ballistic performance | ||||||||
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It has the same rim diameter as the 20×102mm but a different length and contour. It is not interchangeable with any other 20×110mm cartridge.[1]