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85 mm FRAG O-365K
Регіон
Egypt
Romania
Категорія
Ammunition, Missiles and precision weapons
The 85 mm FRAG O-365K is a fixed round for anti-aircraft guns. The projectile is rigidly fixed to the cartridge case by two 360º crimping rings engaging in two cannelures located under the twin gilding metal or copper drive bands, one 12.2 mm wide and the other 11.2 mm wide. The 85 mm FRAG O-365K body is made from forged steel; it has relatively thick walls, a bourrelet and a boat tail. The filling is 780 g of cast TNT, although other explosives have been used. One version of the FRAG O-365K was produced in
two-part form, with which the upper portion of the ogive could be unthreaded to enable powder train time fuzes to be employed when firing from anti-aircraft guns. An 85 mm FRAG O-367A round was in service with the East German Army. The complete round weighed 15.9 kg and the projectile 9.54 kg. Muzzle velocity was 805 m/s with a full propellant charge (2.77 kg) or 655 m/s with a reduced (1.52 kg) propellant charge. The cartridge case is usually brass, although lacquered steel has been used. It contains 2.6 kg of 14/7 stick and powder propellant plus S-1 decoppering agent and wear additives, to provide a muzzle velocity of 793 m/s, although some reduced propellant loads were developed and produced. A percussion primer is threaded into the base and surrounded internally by a black powder priming charge. The muzzle velocity of 793 m/s can produce a maximum range of 15,650 m when fired from the 85 mm Divisional Gun D-44. For training use over short ranges a special variant of the 85 mm FRAG O-365K was developed. This reduced range version contains a self-destruct assembly threaded into, and protruding from, the projectile base and containing a tracer element burning for 2 to 6 seconds. The self-destruct device operates between 3.5 and 5 seconds after firing, equating to a range between 2,000 and 3,400 m. This training round is otherwise identical in appearance and external ballistics to the operational 85 mm FRAG O-365K, including the retention of the nose-mounted fuze. It is still produced in Romania where it is marketed by SN ROMARM SA.