SS-11 Sego
Service history
In service 21 July 1967 (document №705-235)1974
Used by Soviet Union
Production history
Manufacturer design by OKB-52 of V.N.Chelomey, production by Khrunichev Machine-Building Plant, Omsk aviation facility №166 "Polyot", Orenburg aviation facility №47 "Strela"
Weight 41.4-42.3 tonnes
Length 16.93 metres
Diameter 2 m
Warhead 1
Blast yield 1 Mt by NII-1011, Chelyabinsk-70


two-stage liquid fuel

  1. first stage 8S816 with a 15D2 module (three RD-0216 and one RD-0217 engines)
  2. second stage 8S817 with one 15D13 main and one four-nozzle 15D14 (RK-3) engines)
10,600 km

The UR-100 (Russian: УР-100) was an intercontinental ballistic missile (ICBM) developed and deployed by the Soviet Union from 1966 to 1996. УР in its designation stands for " Универсальная Ракета" (Universal Rocket). It was known during the Cold War by the NATO reporting name SS-11 Sego and internally by the GRAU index 8K84.

The similar designation UR-100MR actually refers to an entirely different missile, the MR-UR-100 Sotka (SS-17 Spanker).


The UR-100 was a two-stage liquid-propellant lightweight ICBM. Initial versions carried a single warhead of 0.5 to 1.1 Mt yield, while later versions could carry three or six MIRV warheads. The missile was silo-launched. 15P784 silo design (by KBOM, Design Bureau of Common Machinery, of V.P.Barmin) was greatly simplified in comparison to earlier missiles. Facilities consisted of hardened, un-manned silos controlled by a single central command post. This was the first soviet ICBM (8K84M, entered service on 3 October 1971) equipped with missile defense countermeasure "Palma" by NII-108 of V.Gerasimenko.

Variants and developments

Operational history

 Soviet Union
The UR-100 reached initial operational capability with the Strategic Rocket Forces in 1966, and by 1972, 990 launchers had been deployed. An additional 420 launchers of newer version missiles were added by 1976. The missile was deployed as a counterpart to the United States' LGM-30 Minuteman, and relied on numbers for effectiveness. Original versions were phased out during the 1970s, but 326 of the newer missiles (8K84M, UR-100N, UR-100NUTTH) remained in service by 1991. These were phased out completely by 1996. Strategic Rocket Forces was the only operator of the UR-100.

Formations included:

See also

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