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85 mm AP-T BR-365 and BR-365K

Region
Egypt
Czech Republic
Romania
Category
Ammunition, Missiles and precision weapons
The 85 mm AP-T BR-365K (complete round designation is UBR-365K) is a fixed round with the projectile rigidly fixed to the cartridge case by a single 360º crimping ring engaging in a cannelure located to the rear of the twin copper drive bands. The 85 mm AP-T BR-365K projectile body is a solid hardened steel assembly with a relatively short ogive and two distinctive cannelures set into the body forward of the pressed copper drive bands. The centre of the projectile base is recessed to accommodate a small (48 g)
two-part A-IX-2 (desensitised RDX/Aluminium) bursting charge, the MD-8 base fuze and a No 7 tracer assembly in a protruding housing. The brass cartridge case (lacquered steel has been used) has a percussion primer threaded into the base and contains 2.6 kg of stick and granular propellant (14/7 CB and 18/1 TPCB), plus S-1 decoppering and wear additives, providing a muzzle velocity of approximately 800 m/s. This enables the 85 mm AP-T BR-365K to penetrate 94 mm of armour plate set at an angle of 0º at the maximum direct fire range of 970 m. The first of the full calibre 85 mm AP-T rounds was the BR-365. This was replaced by the later and generally improved 85 mm AP-T BR-365K. Although superseded by the more powerful 85 mm HVAP-T BR-365P and BR-365PK (see previous entry), the 85 mm AP-T BR-365K remains in service with some former Warsaw Pact nations and nations to whom Soviet military aid was extended, but it is generally regarded as obsolete. The type is still available from Romania where it has been manufactured for export sales by ROMARM; although series production is no longer carried out. Production facilities were also available in Egypt although it is understood that production there has ceased. Applications include 85 mm Divisional Gun D-44 ; 85 mm Auxiliary-propelled Field Gun SD-44 ; 85 mm M1944 ZIS-S-53 tank gun; 85 mm Anti-aircraft Gun M1939 and M1944 ; 85 mm Field Gun Type 56 ; 85 mm Field Gun M52 and M52/55.