Over-all length (with gaine): 3 15/16 inches.

Maximum diameter: 1 15/64 inches.

Threaded length: 3/4 inch.

Number of threads: 8.

Construction: The fuze consists of two sections housed in a one-piece body. The two sections are separated by a fuzed striker housing. The upper section consists of a flash cap and a set-back striker and striker block separated by a safety spring and upper safety fork. Below the flash cap is a hard block of black powder. The safety plunger is spring-loaded upward against the block by the safety plunger spring, which also bears against the fixed striker housing. Two safety plungers which are fixed to the safety plun-ger holder protrude through holes in the fixed firing pin. The fixed firing pin and inertia primer housing are separated by an anti-creep spring and lower safety fork.

Operation: The upper safety fork is removed from the fuze in the nose section, the other forks having been removed during assembly of the round. Upon setback the set-back striker hits the flash cap. The flash from the cap burns the black-powder plug and allows the safety plunger holder to move forward. This raises the two safety plungers, exposing the fixed striker to the detonator carrier. On impact the detonator carrier mo-ves forward against the anti-creep spring and hits the fixed firing pin.

Figure 328 – Type 98 Interior Fuze.