W49

W49 warhead
The W49 warhead
Type	Nuclear weapon
Service history
In service	1958 to 1965
Used by	United States
Production history
Designer	Los Alamos National Laboratory
Variants	7
Specifications
Mass	1,640 pounds (740 kg)
Detonation mechanism	Contact, airburst
Blast yield	Y1: 1.1 megatonnes of TNT (4.6 PJ) Y2: 1.45 megatonnes of TNT (6.1 PJ)

The W49 was an American thermonuclear warhead, used on the Thor, Atlas, Jupiter, and Titan I ballistic missile systems. W49 warheads were manufactured starting in 1958 and were in service until 1965, with a few warheads being retained until 1975.

The weapon itself was a Mark 28 Y1 warhead modified for the missile role.