The W48 was an American nuclear artillery shell, fired from a standard 155 mm (6.1 inch) howitzer, e.g. the M114 or M198. It was manufactured starting in 1963, and all units were retired in 1992. The W48 was 6.1 inches (155 mm) in diameter and 33.3 inches long. It came in two models, Mod 0 and Mod 1, which are reported to have weighed 118 and 128 pounds respectively. It had an explosive yield equivalent to 72 tons of TNT (0.072 kiloton), which is very small for a nuclear weapon.