EMPLOYMENT: Mechanical Impact Nose Fuze for 40-mm Bofors Gun H.E. shell. (See fig. 567.)

DATA:

Over-all length: 1.125 inches.

Maximum diameter: 0.75 inch.

Threaded length: 0.219 inch.

Number of threads: 5 RH.

CONSTRUCTION: Fuze is identical with the British Type No 250. The fuze is made of brass and steel. The upper and lower body surrounde the inner housing which contains the retaining collar and the retaining collar spring. In the lower body is the primer hous-ing, striker retaining balls. in the top of the upper body is a wooden hammer.

ACTION: Set-back causes the inner housing to move back, releasing the pressure on the centrifugal pin. Centrifugal force causes the pin to move out and upon deceleration, the retaining collar moves up under pressure from its spring. As the collar moves up, the balls in the primer housing are free to move out under centrifugal force. This releases the stri-ker and it drops into position so that on impact, the hammer forces the striker onto the primer.

REMARKS: The self-destroying element is in the tracer.

Figure 567 – K.Z. 38