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The W42 was an American nuclear warhead developed in 1957.

In December 1957 the Army requested the Atomic Energy Commission to develop a nuclear warhead for the HAWK low-to-medium altitude surface to air missile. In July 1958 the military characteristics were approved for the new warhead and the design released. Two months later the requirement for a HAWK with a nuclear warhead was cancelled.

It equipped the AIM-47 Falcon long-range air-to-air missile.