Construction: The fuze is a centrifugally armed point detonating fuze constructed in two parts. The upper body contains a copper closing disk and threads onto the lower body to form the head of the fuze. The lower body houses the striker and centrifugal detents, and is threaded to take the gaine. The lower portion of the striker has a smaller diameter forming a shoulder to bear against the detents. The upper end is hollowed to receive the striker head. The striker head has a disk on the upper end to form the strik-ing head, and a flange to prevent its being seated too deeply in the hollowed end of the striker. The centrifugal detents are pivoted on a mounting which threads into the base of the lower body above the gaine. A spring band holds them under the striker shoulder. The detents are so arranged that they can only move out in sequence to release the striker.

The gaine threads into the lower fuze body.

Operation: Rotation of the rocket is flight causes the centrifugal detent to move out against the detent spring so as to clear the shoulder of the striker. Impact crushes the fuze head and drives the striker down into the gaine.

Figure 438 – Type 4 Nose Fuze.