W49 Warhead

The W49 was a thermonuclear 1.45-megaton warhead used by the United States of America during the Cold War on the Atlas, Thor, Jupiter, and Titan I ballistic missile systems. W49 warheads were built from 1958 by Los Alamos Scientific Laboratory and were in service until 1963. A few warheads were kept in the US arsenal until 1975. Being 20 inches in diameter and 58 inches long, the W49 thermonuclear warhead was a derivative of the B28 nuclear bomb nuclear warhead design and had a yield of 1.45 megatons. Depending on the model, it weighed between 1,640 and 1,680 lbs.