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ZB-60


15mm Besa


Overview


15mm ZB-60

Axis forces using a 15mm ZB-60 in the anti-aircraft role during World War 2.
Source: Unknown author - © Copyright lies with original owner

Origin
Czechoslovakia
Type
Heavy machine gun
Entered service
Mid 1930's (ZB-60)
1940 (Besa 15mm)
Status
Out of service
Development
1933 - 1937
Developer
Czechoslovakia - Zbrojovka Brno
Production
1938 - 1944
Producer
Czechoslovakia - Zbrojovka Brno
Prototypes for testing, 1934 - 1937
Czechoslovakia - Zbrojovka Vsetín
Series production from 1938
Nazi Germany - Zbrojovka Vsetín
Produced under Nazi occupation as part of Herman Göring Werke
United Kingdom - BSA
License production from 1940 to 1949
Number produced
About 700 in Czechoslovakia before occupation
About 450 under German occupation
Over 3.200 15mm Besa Mk. II
Notable users
United Kingdom
Nazi Germany
Yugoslavia

Description


Introduction

The ZB-60 is a World War 2 era heavy machine gun of Czechoslovak origin. Design efforts started in the early 1930's for a 20mm automatic gun for anti-tank service. In 1933 the design parameters were altered to the 15x104mm Skoda round as a large caliber heavy machine gun. The vast majority of these guns were produced under license in the UK as the 15mm BESA machine gun.

Design

The ZB-60 is an upscaled version of the ZB-53 design. It is a gas operated, select-fire, belt-fed weapon. It is an air cooled weapon that fires from the open bolt position. It uses steel belts feeding from right to left. A quick change barrel system allows for a greater volume of fire. For vehicle use a pistol grip with trigger was fitted. In the infantry role two horizontal handles and butterfly trigger was used.

Firepower

The ZB-60 fires the 15x104mm Skoda round. It is a belt-fed weapon using 40 round belts as designed, or 25 round belts in UK service. It is a select fire weapon with semi and fully automatic settings. Cyclic rate of fire is 420 rpm. Semi-automatic fire was deemed preferable in infantry use and vehicle mounts due to the harsh recoil. Effective range is quoted as 1.8 km. The 15mm rounds could be used against light armor. Testing showed penetration characteristics of 28 mm steel at 50 meters, 16 mm at 350 meters and 6 mm at 1.5 km.

Platforms

In the infantry role the ZB-60 was mounted on a two wheel tripod mount. When employed on its tripod it provided a more stable platform and allowed it to be used in the anti-aircraft role as well. Gun and wheeled mount weighed 205 kg. This could be manhandled in the field by its crew.

Several types of fortification mounts and turrets were tested but never uses. ZB-60 was planned for use on the Skoda T-2 reconnaissance tank, which was never adopted due to the occupation of Czechoslovakia. In UK service the 15mm Besa was used on various marks of Humber armored cars and Mk.VI light tanks. The 15mm Besa was issued with 25 round belts, limiting practical rate of fire. The 15mm Besa was mostly used in semi-automatic due to recoil and these shorter belts.

Users

As early as 1934 the ZB-60 was tested by the Czechoslovak military. Which did not adopt it due to accuracy concerns and excessive recoil even with its weight. For several years it was planned as a fortification gun where the recoil could be easily managed by stronger mounts, until the heavy machine gun was dropped from the fortification concepts. In 1937 the ZB-60 was adopted by Yugoslavia and the UK acquired a license. A batch was sold to Iran. Under Nazi German occupation captured weapons and newly produced ones were used as anti-aircraft guns, including by the Kriegsmarine.

Variants


15mm ZB-60

ZB-60 heavy machine gun seen on its infantry wheeled tripod mount. Unusual setup with pneumatic tires. Reportedly photographed in 1938.
Source: www.modernfirearms.net - © CC BY-SA 4.0

List of production models

ZB-60
Czechoslovak production model. Produced for export to Iran, Yugoslavia and the United Kingdom. 40 round belts were standard issue on the infantry mount.
15mm Besa Mk II
License production model. Produced in the UK by BSA for use in light armored vehicles. Used 25 round belts in UK service.

Details


Facts ZB-60
General
Origin
Czechoslovakia
Type
Heavy machine gun
Caliber
Caliber
15x104mm B
Feed system
Belt fed
40 round belts
Barrel length
1.46 m
Rifling
8 grooves, right hand twist
Muzzle velocity
860 - 930 m/s
883 m/s for Mark Iz ball
Operation
Action
Gas operated, fires from open bolt
Locking
Tipping bolt locking
Fire selector
0 - 1 - F
Rate of fire
420 - 430 rpm
Quick change barrel
Yes
Dimensions
Length
2.05 m
Weight
55 kg gun only
23 kg for spare barrel
203 kg for gun on wheeled tripod mount
Sights
Mechanical
Bladed post front, adjustable sight rear
Optional anti-aircraft sights

Nomenclature


15mm Besa Mk. II

Right side view of British produced 15mm Besa Mk. II vehicle machine gun.
Source: Unknown author - © Copyright lies with original owner

List of designations

Mitralez 15mm M 38
Yugoslav service designation for Czech produced ZB-60 for infantry use on wheeled tripod mount.
15mm Besa Mk. II
License production ZB-60 in UK military service. It is possible that the original batch of 140 ZB-60 produced in Czechoslovakia were designated 15mm Besa Mk. I.
15 mm FlaMG 39(t)
Beutewaffe index for Czechoslovak captured and new production ZB-60.
15 mm FlaMG 490(j)
Beutewaffe index for ZB-60 captured from Yugoslavia.
15 mm Kampfwagen-Maschinengewehr 376(e)
Beutewaffen index for captured 15mm Besa vehicle machine guns.

Media


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The Soviet KPV is of a similar size, weight and caliber as the ZB-60. The KPV proved to be a more successful design with widespread service after World War 2.