Use: 25-mm H.E. projectiles.

Over-all length (with gaine): 1 15/16 inches.

Over-all length (without gaine): 1 7/16 inches.

Maximum diameter: 3/4 inch.

Threaded length: 3/16 inch.

Number of threads: 6 R.H.

Construction: The fuze is constructed of brass in two pieces, the upper or nosepiece threading onto the main body. The striker extends from the nosepiece into the lower fuze body and is supported by a centrifugal detent. A centrifugal flash-hole shutter separates the primer from the gaine, and the shutter housing has a shoulder on which the primer cap rests. The gains threads into the bottom of the fuze and holds the shutter housing in place.

Operation: After firing, centrifugal force moves the detent out and also causes the flash-hole shutter to move, exposing the flash-hole. On impact, the striker is driven into the primer, which flashes into the gaine.

Figure 341 – 25-mm Model 1 Fuze.