Use: 75-mm A.P.-H.E. projectiles for the type 41 and 94 mountain guns and the type 90 mountain guns and the type 90 field gun.

Over-all length (with gaine): No data.

Over-all length (without gaine): 2 inches.

Maximum diameter: 2 1/16 inches.

Threaded length: 15/16 inch.

Number of threads: 11.

Construction: This fuze is made of black steel into two separate parts, which are threaded separately into the base of the projectile. The rear part contains a tracer ele-ment which is separarted from the working mechanism of the fuze by a steel partition. The working mechanism consists of two spring-loaded detents which fit into a circumfe-rential recess in the metal primer carrier and when in the unarmed position hold the pri-mer carrier from the firing pin. There is a small coiled spring loated between the firing pin and the primer carrier. The firing pin has two small flash channels leading down to the explosive gaine. The gaine threads into the fuze pocket with threads of the same diame-ter as the fuze proper.

Operation: Centrifugal force moves the detents out from the primer carrier, which is then separated from the stationary firing pin by the spring only. On impact, the primer moves down upon firing pin, flashing through the flash channel to the gaine.

Figure 340 – Mk 1 Medium Impact Base Fuze.