British Bomb, 4000 lb HC, Mk 2, Mk 3, Mk 4, Mk 5, Mk 6
The body consists of a fabricated steel, cylindrical shell with a domed plate welded to the nose end, parallel sides, and a closing plate bolted to the angle ring, which is welded in position a short distance inside the after end. The closing plate has a central adapter for a screw-in plug and two drop handles. The nose dome houses three exploder containers, the center one of which is extended through the body by a central tube. The Mk II has two side fuze pockets near the rear of the body. Mks II and III have strengthening beams running fore and aft, welded to the inner surface of the body, and acting as a pad for the suspension lug and hoisting brackets. The Mk IV has steel blocks to support the suspension lug and hoisting brackets, and has no beam.
The tail is a cylinder of light gauge plate, closed at the rear by a diaphragm plate which is welded in position. Tail securing screws thread into corresponding holes near the rear edge of the body shell. The forward portion of the cylinder has saw-cuts between adjacent screw clearance holes, so that the tail can be sprung into the rear of the bomb body.
A single suspension lug, 43 in. from nose dome, is bolted to the bomb body and the steel support block.
These bombs may be fitted with a nose attachment to retard them in flight, consisting of light-gauge plate around the forward end of the body shell which projects beyond it around the nose piece. The side fuze pockets on the Mk II are usually not used but might contain a Time Pistol No. 47.
The Mk V is the same as Bomb Mk IV, but was made and filled in the US. The Bomb Mk VI was made in US, and has a metal box for lugs and other fittings welded to the rear of the bomb body.