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he F-35B Lightning II has a weapons payload of 15,000 lbs and can carry a variety of air-to-air and air-to-ground weapons, including missiles, bombs, and guided munitions. The specific weapons loaded depend on the mission requirements

https://en.m.wikipedia.org/wiki/B61_nuclear_bomb

Mass 715 pounds (324 kg)^[2]

Length 141.6 inches (3.60 m)^[2]

Diameter 13.3 inches (34 cm)^[2]