US Cartridge, 81mm HE, M821A1
This cartridge is a high explosive round developed for use in the M252 improved 81mm mortar system. It is intended for use against personnel and material providing both blast and fragmentation effect.
The complete round consists of a fuze, four increment charges, fin assembly, ignition cartridge, and shell body. The shell body, made of forged steel material, is loaded with a Composition B (RDX/TNT) filler. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. The propellant charge is contained in four horseshoe felt fiber containers and assembled around the fin assembly shaft.
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Collaborative Ordnance Data Repository