US Cartridge, 105mm HEAT-T, M662
This cartridge is a fixed high-explosive antitank round for utilization with 105mm howitzers for an expanded capability in a direct-fire mode against armor and hard targets.
The projectile configuration is that of a steel body cylinder having a plastic obturating band and M509A1 point initiating base detonating (PIBD) fuze with a standoff spike assembly threaded to the front and a tin and boom assembly threaded to the rear. The loading of the projectile consists of a Comp B shaped charge formed by a funnel-shaped copper liner within the body. A piezoelectric element is fitted to the spike assembly and connected to the M509A1 PIBD fuze in the body. The fin assembly is threaded to receive an M13 tracer assembly. The cartridge is of the fixed type, i.e., the M201 cartridge case is crimped to the projectile and requires a minimum bullet pull of 3,000 pounds.
The cartridge case is of the two-piece spiral design and contains an M100 MOD percussion primer, an igniter pad and 57 ounces of M30 propellant.