British Bomb, 500 lb GP, Mk 1, Mk 2, Mk 3
The body is a streamlined steel casting or forging threaded at the nose to take the nose adapter, which holds the central exploder tube. At the opposite end is a threaded base plug through which the exploder tube passes. Welded to the after end of the body is a streamlined cone of thin metal, containing no explosive, which is tapered to take the tail ring. The exploder also passes through this section.
The tail has a truncated cone, which fits over the rear section of the body and is held to it by a locknut over the exploder tube. Four mild-steel fins are fastened to the cone, and are reinforced by a cylindrical strut.
The bomb is suspended by a single suspension lug secured to the body by four screws.
The tail fins are usually painted red when time pistols are used.