DF-4 Country: China Type: IRBM Introduction: 1981

The Dong Feng 4 or DF-4 (also known as the CSS-3) is a long-range two-stage Chinese intermediate-range ballistic missile (IRBM) with liquid fuel. It was thought to be deployed in limited numbers in underground silos beginning in 1981. American intelligence estimates suggest that the Dong Feng 4 IRBM will continue to serve as a regional deterrence instrument until they can be replaced by the DF-31.

The decision to develop the DF-4 was made in 1965 in response to the US ballistic missile submarine patrols that began operating out of Guam. There were two versions of the missile developed, one version housed in caves or garages to be rolled out on launch and another silo based version.

General Information
Developed by	China
Deployed by	China
Development Year	1965
Deployment Year	1981
Platform	silo or, stored in caves and moved outside before launching
Number manufactured	about 30
Number deployed	10-20(as of 1997)
Contractor	the Wan Yuan Industry Corporation
Design	First Academy of the Ministry of Aerospace Industries

Dimensions and Performance
Length	28.0m(1st-stage:16.7m,2nd-stage:7.0m,warhead:4.3m)
Body Diameter	2.25m
Launch Weight	82,000kg
Range	1,200-4,750km
Accuracy	1,500m CEP

Components
Propulsion	2-stage liquid-fuel rocket motor
Engine	1st-stage:4xYF-2A(104T thrust), 2nd-stage:1xYF-3(32T thrust)
Payload	single warhead 2,200kg
Warhead	1-3MT nuclear warhead
Guidance	inertial