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M57 120mm High Explosive Cartridge

The M57 High Explosive Cartridge is designed for use with the M120 120mm Towed Mortar System and is used against personnel, bunker and light materiel targets. The steel projectile is loaded with TNT explosive. The M57 is equipped with the M935 Point Detonating Fuze which functions in the Impact mode. The M57 was procured by the U.S. Army in limited quantities as a foreign (Israel) nondevelopmental item.

The M57 consists of the following major components:

• Projectile Body Assembly
• Propelling Charges
• Ignition Cartridge
• Fin Assembly
• M935 Point Detonating Fuze

Propelling Charge Zone	Muzzle Velocity	Minimum Range	Maximum Range
0	108 m/s	200 m	1000 m
1	137 m/s	500 m	1700 m
2	164 m/s	700 m	2400 m
4	212 m/s	1300 m	3800 m
6	255 m/s	2300 m	5100 m
8	292 m/s	3300 m	6300 m
10	320 m/s	3500 m	7200 m

Maximum Rate of Fire.........15 rounds/min (first minute)
Sustained Rate of Fire..........4 rounds/min
Cartridge Weight..........13.27 kg (29.2 lb)

Sources and Resources

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