Name: Cartridge, 90 mm: HEAT, M371A1
Availability: InStock

Item Type

Item State

Type

Action

Guidance

Caliber

Weights complete round

Weights explosive

propellant 594 g

Length

Muzzle velocity

Max range

Eastern Asia

South Korea

<h2>Armament</h2><p>M67 rifle.</p><h2>Development</h2><p>The 90 mm M67 recoilless rifle was designed from the outset to be a shoulder-fired, direct fire anti-armour weapon with the accent on simplicity and lightness. It was developed during the 1950s and originally intended to use only one operational round, the 90 mm HEAT M371, later developed to the M371A1 stage. The 90 mm M67 rifle has now passed from US service, although some may still be held in reserve, but the weapon and its ammunition continue to find favour with nations such as South Korea where it is retained in service and full-scale production (along with the 90 mm HEAT M371A1).</p><h2>Description</h2><p>The 90 mm HEAT M371A1 is a fixed round with the carbon steel and aluminium projectile rigidly secured to the aluminium cartridge case. The projectile holds a 780 g shaped charge of Composition B contained in a copper cone. In front of this is a standoff spike threaded onto the body containing a piezoelectric element and a paper insulating cup. Threaded onto the base is an aluminium adaptor which also has a PIBD M530 or M530A1 fuze. The adaptor is threaded to a hollow perforated boom assembly with six T-shaped tailfins. The M112 aluminium cartridge case contains the M82 propelling charge, formed by 594 g of granulated M5 double-base multiperforated propellant in a silk bag located around the boom and fin assembly behind the projectile body. The base of the cartridge case holds a rupture disc held in place by the M92A1 percussion primer (the original M371 used a M78 primer), which is connected to a black powder ignition cartridge located between the fins of the fin assembly. On firing, the burning propellent gases force the projectile along the barrel and off the rupture disc from the base of the cartridge case, so that recoil can be minimised by the controlled pressure relief of the gases through apertures in the breech block. Once in flight the projectile is stabilised by the fin assembly until it impacts with a target. The piezoelectric element then functions to trigger the PIBD fuze while the standoff spike provides the optimum distance for the shaped charge to operate. When used against personnel targets the round is directed into the ground to produce a graze effect, the fuze being initiated on impact by a stab primer instead of the piezoelectric element. Maximum range of the 90 mm HEAT M371A1 is 400 m and muzzle velocity is 213 m/s. The training round used to simulate the firing of the 90 mm HEAT M371A1 is the Cartridge, 90 mm: Practice, M371. This is similar to the operational HEAT round except that the explosive filling is replaced by an equivalent weight of an inert material. A Mox 2B smoke pellet is ignited by the PIBD M530 fuze on impact providing a puff of smoke for marking purposes. A Cartridge, 90 mm: Canister, Anti-personnel, M590 was type classified for firing from the 90 mm M67 Rifle but appears to have been little used. Intended for anti-personnel use it was filled with 2,400 flechettes weighing a total of 1.13 kg (each flechette weighed about 0.5 g). Maximum effective range was 200 m. Total weight was 3.08 kg and length 485.6 mm. Muzzle velocity was 366 m/s.</p><h2>Authorised fuzes</h2><p>PIBD M509 or M509A1 Equivalent rounds KOREA, SOUTH</p><h2>Manufacturer</h2><p>Daewoo Corporation</p><p>Type: HEAT M371A1</p><p>Description: Standard US specifications</p><h2>Manufacturer</h2><p>Korea Explosives Company Ltd</p><p>Type: HEAT M371A1</p><p>Description: Standard US specifications</p><h2>Manufacturer</h2><p>Poongsan Corporation</p><p>Type: HEAT M371A1</p><p>Description: Standard US specifications.</p>

The Cartridge, 90 mm: HEAT, M371A1 is an armament M67 rifle. Development The 90 mm M67 recoilless rifle was designed from the outset to be a shoulder-fired, direct fire anti-armour weapon with the accent on simplicity and lightness.

It was developed during the 1950s and originally intended to use only one operational round, the 90 mm HEAT M371, later developed to the M371A1 stage. Technical references retained in this configuration include 780 g, 530A, 594 g, 92A, 1.13 kg, 0.5 g, 3.08 kg, 485.6 mm, 509A.

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Cartridge, 90 mm: HEAT, M371A1

Cartridge, 90 mm: HEAT, M371A1

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