Over-all length

Maximum diameter

Thread diameter

Markings

This fuze screws into a recess in the base of the shell cavity. The fuzes consists of a moviable detonator holder, a fixed firing pin, and a centrifugal arming bolt with a setback element. In the head of the fuze is screwed the booster for the shell. The centrifugal bolt separates the detonator from the fixed firing pin, and a setback element locks this bolt in position. A protruding shear wire prevents the detonator from hitting the firing pin after the centrifugal bolt clear the channel. Two channels extending through the length of the inner body are closed at the top by aluminum discs. These channels provide es-cape holes for pressure if the detonator is accidentally detonated. The steel firing pin, with four flash holes formed around it, is screwed into a projection in the top of the inner body.

On acceleration, the detent sets back, thereby releasing the centrifugal bolt. During set-back, the bolt is held by friction. On deceleration, the bolt is moved clear of the detona-tor and the firing pin by centrifugal force and causes the detonator to creep forward un-til its shear wire rests on the shoulder. On impact, the detonator holder breaks the shear wire and hits the firing pin. The flash produced passes through the flash-holes around the firing pin and initiates the booster.

Figure 225
Base Fuze 100/17 Hollow-Charge