CONSTRUCTION. The bomb is cast iron and consists of a body into which is screwed the nose cap and the male base plate. A copper plated steel spring fits into a recess machi-ned in the base plate and bears against a plastic igniter holder containing an electric de-tonator. The igniter holder fits over a brown plastic insulating adapter which houses the gaine and has two terminals to which the wire leads of the detonator are connected. Two electric leads are connected to the terminals and are led along the inside of the body to the nose fuze. A 32° truncated conical-shaped steel liner is flanged at its base, the flange being slotted at three points to accommodate the two electric leads and the locating pin. The explosive filling is poured through the base of the body around the cone. A plastic support is secured between the flange of the cone and the nose piece. Two holes are drilled through this support for the terminal pins of the fuze to which the electric leads are soldered. The fuze seats on a shoulder in the nose and is secured by a fuze retainer ring which has eight outlet vents. (See fig. 41.)

The tail is sheet steel. It is of the ring strut type with four longitudinal struts spot wel-ded. Each strut forms one segment of the tail cone. The tail is secured to the body by means of four prongs punched into corresponding recesses in the bomb body.

On impact, the (66) fuze induces an electric current which passes via the electric lead to the detonator. The squib is thereby fired, setting off the gaine and the charge.

SUSPENSION:

74 bombs in AB 500-1 container.
40 bomb in AB 250 container.

Bombs are packed nose in tail, thus increasing fuze safety.

COLOR AND MARKINGS. Buff or fawn color over-all. The marking "SD4HL" is stencilled on the body. It is presumed the H means Hohl or hollow, and L stands for Ladung or charge.

Figure 41 – SD 4-kg Hollow Charge Bomb