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20mm Hispano-Suiza HS.820


Oerlikon KAD | M139


Overview


20mm Hispano-Suiza HS.820

20mm Hispano-Suiza HS.820 with left hand single feed mechanism.
Source: Unknown author - © Copyright lies with original owner

Origin
Switzerland
Type
Autocannon
Entered service
Early 1950's
Status
In service
Development
Late 1940's
Developer
Switzerland
Production
1949 - Present?
Producer
Switzerland - Hispano-Suiza (up to 1970)
Switzerland - Oerlikon-Contraves (since 1970)
United States - Possible US production of M139
Number produced
Produced in large quantities
Designations
Oerlikon KAD (Oerlikon product lineup after acquisition)
M139 (US service)

Details


Facts 20mm HS.820 (KAD)
General
Origin
Switzerland
Type
Autocannon
Caliber
Caliber
20x139mm
Feed system
Single belt-feed, left or right hand feed
Magazine or drum feed
Barrel length
1.840 mm
1.906 mm including muzzle brake
Rifling
9 grooves, right hand twist
Muzzle velocity
1.050 m/s for HEI / APHEI
Barrel life
15.000 rounds
Operation
Action
Gas unlocked, delayed blowback
Rate of fire
1.000 rpm
Dimensions
Weight
66 kg gun only
Length
2.565 m
Width
158 mm with belt feed
Height
239 mm with belt feed
0.2 m with drum feed

Application


Oerlikon GAI-D01

The Hispano-Suiza HS.666A twin gun mount is armed with two HS.820 autocannon. This was renamed GAI-D01 with KAD autocannon after acquisition by Contraves.

HS-30

The West German SPz 12-3, also known as HS-30 or Sch├╝tzenpanzer Lang, is armed with a HS.820 autocannon in a one man turret. A total of 2.000 rounds are carried for this gun.

VDAA

The M3 VDAA is fitted with a TA-20 turret developed by Hispano-Suiza with two HS.820 autocannon. Since all production took place after sale to Contraves, all are fitted with the renamed KAD autocannon.

VDAA

The VAB VDAA is fitted with the same TA-20 turret as used on the M3 VDAA.

Related articles


30mm Hispano-Suiza HS.831

The HS.820 is a downscaled version of the 30mm HS.831 design.

20mm Rheinmetall Rh-202

The German Rh-202 autocannon fires the same 20x139mm ammunition as the HS.820.

20mm Giat M693

The French M693 autocannon fires the same 20x139mm ammunition as the HS.820.