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This is an overview article which contains background information and cross-game comparisons. For game-specific information and stats, see the articles linked on the right.
Gameplay articles
Fallout 3Fat Man
Experimental MIRV
Fallout: New VegasFat Man
Gun Runners' ArsenalEsther Gun Runners' ArsenalGametitle-FNV GRA
Fat Man (GRA) Gun Runners' ArsenalGametitle-FNV GRA
Fallout 4Fat Man
Fallout ShelterFat Man
Gametitle-FO3Gametitle-FNVGametitle-FO4Gametitle-FOSGametitle-FNV GRA
Gametitle-FO3Gametitle-FNVGametitle-FO4Gametitle-FOSGametitle-FNV GRA

The Fat Man, officially designated the M-42 Tactical Nuclear Catapult, is a weapon which appears in Fallout 3, Fallout: New Vegas, Fallout 4, and Fallout Shelter.


The Fat Man was conceived, developed and tested inside the Fort Strong armory in Boston. Several houses have been constructed around the fort, to provide a testing area to ascertain how much damage the weapon would cause in an urban environment.


Fat ManEdit

Fat Man

The M42 Fat Man is an effective mortar/artillery weapon, allowing a person to bombard a large area with good precision and deadly force. It uses a mini nuke for ammunition which when fired, results in a small nuclear blast.

Experimental MIRVEdit

Fat Man
Gameplay article: Fallout 3

Although highly similar to the Fat Man, the experimental MIRV fires 8 mini nukes at once instead of 1, making it more powerful and with a bigger blast radius, at the cost of losing 8 mini nukes at once.


Gameplay article: Gun Runners' Arsenal

Esther is a unique Fat Man with a different rear mechanism, a blast shield, a light-blue body, and a thick glass or plastic bed holding the mini nukes. It weighs 10 pounds more than a standard Fat Man, but does not jam, and is more powerful.

Behind the scenesEdit

The Fat Man was named after the atomic bomb which the United States dropped over Nagasaki in 1945. To avoid controversy, it was renamed Nuka Launcher in the game's Japanese version.