W84

The W84 is an American thermonuclear warhead designed for use on the BGM-109G Gryphon Ground Launched Cruise Missile (GLCM). It is a derivative of the B61 nuclear bomb design and a close relative of the W80 warhead used on the AGM-86 ALCM, AGM-129 ACM, and BGM-109 Tomahawk SLCM cruise missiles.

The W84 is a two-stage radiation implosion warhead with a variable yield ranging from 0.2 kiloton up to 150 kilotons.

The W84 was designed at Lawrence Livermore National Laboratory starting in 1978, based on the B61 nuclear bomb weapon design originated at Los Alamos National Laboratory. Manufacture of this warhead commenced in 1983. Sources differ regarding the total number of units produced, though the figure is known to be either 350 or 530.

The W84 is 32,5 centimeter (13 inches) in diameter and 85 centimeter (34 inches) long, slightly wider and longer than the W80 warhead used on air-launched and submarine-launched cruise missiles. It weighs 176 kilogram (388 pounds), almost 45 kilogram (100 pounds) heavier than the W80.