20×110mm USN

20×110mm USN
TypeAutocannon
Place of origin USA
Service history
In service1950s–present
Used byUnited States Navy
Royal New Zealand Air Force
WarsVietnam War
Production history
DesignerUnited States Navy
Specifications
Case typeRimless, bottleneck
Bullet diameter19.9 mm (0.78 in)
Neck diameter20.6 mm (0.81 in)
Base diameter29 mm (1.1 in)
Rim diameter29.5 mm (1.16 in)
Case length109.5 mm (4.31 in)
Overall length185 mm (7.3 in)
Primer typeElectric
Maximum pressure600 MPa (87,000 psi)
Ballistic performance
Bullet mass/type Velocity Energy
1,700 gr (110 g) Mk 105 HEI 3,350 ft/s (1,020 m/s) 55,000 j

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.

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.

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