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Sumitomo Type 62 (NTK-62)


General Purpose Machine Gun / Medium Machine Gun (1962)


Infantry Small Arms / The Warfighter

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Jump-to: Specifications

The reliable and well-made Sumitomo Type 62 has served the Japan Ground Self-Defense Force well since its inception in 1962.



Authored By: Staff Writer | Last Edited: 10/24/2017 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
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After World War 2 (1939-1945), Japan lost its military power and underwent a period of American occupation. After the Treaty of San Francisco, signed on April 28th, 1952, the nation reclaimed its identity and began establishment of its armed forces as the Japan Self-Defense Force (JSDF). In time, local industry began design, development and production of modern military hardware which was centered on doctrine pertaining to Soviet expansion in the region. As with most national powers of the time, Japan moved to adopt a local general purpose machine gun chambered for the established 7.62mm NATO cartridge. This became the Type 62 - or NTK-62 - by Sumitomo Heavy Industries which replaced aging stocks of American Brownnign M1919A4 0.30 caliber machine guns. Design work on the type began in 1954 to which the Type 62 arrived in 1962 (hence its designation) and has since served as the standard machine gun of Japanese forces, broadened into the Type 74 as a vehicle-mounted machine gun.

At its core, the Type 62 is a no-frills medium-class machine system though it is of quality construction and sound engineering. It is a basic belt-fed weapon, feeding from the left and ejecting spent casings from the right. The weapon relies on a gas-operated system which utilizes a cylinder mounted under the barrel to drive the action contained in the receiver. A tipping bolt is used to lock the breech. This allows only full-automatic fire and, due to the air-cooled nature of the gun, limits the operator to short, controlled bursts to avoid overheating the barrel. Barrel-changing is a requisite to avoid deformation or fractures in the barrel assembly and, thusly, the weapon is typically issued to a team of two. The second operator also assists in the feeding of the ammunition belts and to help clear jams. The barrel is finned to provide some baseline cooling while the action is rated for 650 rounds-per-minute.

The Type 62 features a weight of 23lbs with a length of 47 inches. Its barrel measures 21.5 inches long. The cartridge in question is the 7.62x51mm NATO-standard rifle-caliber cartridge seated in the M13 disintegrating link belt. Sighting is through a front and rear iron arrangement with the rear sight seated along the aft portion of the receiver and the forward sight near the midway point of the barrel. It should be noted that optics are optional and understandably increase accuracy. A hinged, folding bipod can be collapsed to facilitate transport and folded down to support the forward end of the weapon when firing. The pistol grip and trigger unit is found at the lower rear end of the receiver. A shoulder stock adds some ergonomic comfort and additional support at the shoulder. The barrel is capped by a slotted flash suppressor.
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The Type 62 has been largely supplanted as a squad support weapon with the JGSDF by the M249. The M249 is produced under local license by Sumitomo and is a copy of the excellent Belgian FN Minimi. The Type 62 remains in used as a General Purpose Machine Gun, medium machine gun and vehicle machine gun. As a vehicle weapon, it is known as the Type 72 and features a lengthier, heavier barrel and actuation through a solenoid arrangement. It retains the same gas system of the Type 62. Rate-of-fire is increased to 700-1,000 rounds-per-minute though, interestingly, the weapon system is lighter than its squad-level sister. In the stationary support role, the weapon is fitted onto the American M2 tripod. The weapon has seen deployment with Japanese forces in the Iraq War though very little noted combat beyond that. It has not seen export.

Specifications



Service Year
1962

Origin
Japan national flag graphic
Japan

Classification


General Purpose Machine Gun / Medium Machine Gun


Sumitomo Heavy Industries - Japan
National flag of modern Japan Japan
(OPERATORS list includes past, present, and future operators when applicable)
Fire Support
Capable of suppressing enemy elements at range through direct or in-direct fire.


Overall Length
1,200 mm
47.24 in
Barrel Length
546 mm
21.50 in
Empty Wgt
22.38 lb
10.15 kg
Sights


Iron Front and Rear; Optional Optics


Action


Gas-Operated; Full-Automatic Fire only

Full-Automatic
Rounds are automatically ejected from the breech, a new cartridge stripped from the feed and set in the chamber, and rounds are continuously fired so long as the trigger is pulled and an ammunition supply exists.
Gas-Operated
Gas-operated system is featured, typically involving a gas cylinder and rear-driven piston directing energy to the bolt component.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


Caliber(s)*


7.62x51mm NATO

Sample Visuals**


Graphical image of a 7.62x51mm / .308 Winchester rifle cartridge
Rounds / Feed


Belt-Fed
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Max Eff.Range
3,280 ft
(1,000 m | 1,093 yd)
Rate-of-Fire
650
rds/min


Type 62 - Base Series Designation
NTK-62 - Alternative Designation
Type 74 - Vehicle-mounted variant; heavier barrel; solenoid support; higher rate-of-fire; lighter overall weight.


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