Used in most Italian H.E. projectiles. The M17 was most widely uses Italian fuze.

M10

Over-all length

Maxium diameter

Thread diameter

Markings

M17

Dimensions

Markings

M10: The cylindrical body is 0.97 in. gauge, brass, screw-threaded with approximately 11 threads to the inch, for insertion in the shell. The flange at the head protrudes from the fuzed shell. A screw-threaded hole at the base receives the detonator plug or transit plug, and leads to an interior recess containing a striker with a firing pin attached. The recess diameter increases to form a shoulder near the base to locate a retaining collar. The recess is screw-threaded below the shoulder to receive a black powder charge. The copper sealing plug seals the flash-hole and is threaded for assembly of the lower stirrup spring and attachement to the striker. In the option the upper spring holds the forward brass inertia ring. The striker has four flash-holes drilled. A firing pin is attached to the striker by two ribs to prevent blocking the flashholes. Various brass detonator plugs are used, containing a detonator and a layer of gunpowder to increase the flash. The Deto-nator M10 and Detonator M10 (allegenti) vary only in dimensions above the screw threads. Detonator M Cortese incorporates a safety device. Under te cap is a thin brass piece, supported by a pin and distance piece, slotted to fit a weight, the pivot of which passes through the body of the detonator plug and bends over to cover the holes. On firing, the set-back bends down the brass piece and releases the weight. On decelera-tion, the weight swings out and uncovers the detonator hole.

One firing, the top inertia ring sets back and overcomes the upper stirrup spring. On im-pact, the striker overcomes the lower stirrup spring, withdraws the copper closing plug from the flash-hole, and forces the firing pin into the detonator.

Figure 197
Percussion Nose Fuze M10