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The W85 was a thermonuclear warhead developed by the United States of America to arm the Pershing II missile. It had a variable yield— often referred to as "dial-a-yield" — which could be set between 5 and 80 kilotons.
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Overview
The Pershing Ia missile was armed with a 400 kiloton W50 warhead. By the early 1970s it was clear that this was far too large to allow the missile to be used as a tactical nuclear weapon — by this time 400 kt was larger than most strategic warheads. The Pershing II had a high accuracy maneuverable reentry vehicle (MARV), equipped with a radar terminal guidance system and carrying a low yield W85 warhead. Like many US nuclear weapons, it was a development of the B61 nuclear bomb - in this case, a modification of the Mod 3/4 design.
After the Pershing missiles were scrapped, all 120 of the W85 warheads produced were modified into B61 bombs, in this case the B61-10 free-fall weapon.
Specifications
The W85 was a cylinder 13 inches (33 cm) in diameter and 42 inches (110 cm) long. The warhead weighed 880 pounds (400 kg). It had a variable yield from 5 to 80 kilotonnes of TNT (21 to 335 TJ).