Construction: The fuze consists of a steel cylinder externally threaded and drilled inter-nally to take a soft metal block in which the striker is friction-fitted. The striker is a steel pin. The end of the fuze is closed by the primer holder.

Operation: Before firing, the striker rests against the base of the fuze and cannot pierce the primer, since the striker block has a concave surface on the forward end. On set-back, the striker block moves back and leaves the striker protruding. On impact, both the striker and striker block move forward with the striker hitting the primer.

Figure 448 – 5-cm Base Fuze.