DESCRIPTION: The fuze A.Z. 5075 is used in the nose of the 3.7-cm Pak. Stielgranate 41 or hollow charge muzzle stick bomb and, excepting the magazine and magazine as-sembly, is similar to the nose fuze described for the rifle and hand, selfdestroying grena-de. (See fig. 562.)

The aluminium body protruding from the nose of the bomb is ogival in shape with an alu-minium striker protruding from a hole at the top. The weight of the fuze is 2-oz. 4½-drs. The designation has not been stamped on fuzes examined to date.

The ogival aluminium body is screw threaded externally for insertion in the bomb and is screw-threaded internally at the base to receive the adapter for the magazine. The in-terior is recessed for the mechanism, the recess being enlarged near the top to permit the expansion of a coiled spring strip.

The aluminium striker is cylindrical with a flange at the base which engages a step in the body and so limits its upward movement. A steel needle protruding from the base of the striker is secured by an aluminium screw inserted in the head. The striker is supported by a spiral spring and a coiled spring strip, both of which are positioned between the base of the striker and an aluminium spring holder.

The spring holder is in the form of a cylinder with a central hole for the needle and a re-cess in the hole to receive the base end of the spiral spring surrounding the needle. Near the top of the holder is reduced in diameter to form a step for the assembly of the coiled spring strip. The lower part of the spring holder is recessed to fit over the top of the ma-gazine holder. The wall of the recess is cut away at four places to permit the four arms of the retaining spring to protrude for the support of the arming sleeve. The retaining spring consisting of a steel disc with a hole for the needle in the center and four arms curved slightly upwards, is held between the spring holder and the top of the magazine holder. The four portions remaining of the wall of the recess in the base of the spring holder are bent inwards to engage an inclined surface near the top of the magazin hol-der.

The steel arming sleeve, surrounding the coiled spring stri fits around the upper part of the spring holder and is supported by the retaining spring. Inside the sleeve, near the base, a circumferential groove is cut to engage the arms of the retaining spring when the sleeve is in the armed position.

The magazine holder consists of a cylindrical aluminium plug recessed and screw-threa-ded internally at the base for the insertion of the magazine. A shoulder formed around the exterior engages a corresponding shoulder in the adapter and carries a locating pin which enters a hole in the shoulder of the adapter. A projection at the top of the holder is bored centrally for the needle and is chamfered near its base for the attachment of the spring holder. The aluminium magazine contains 6.2 grains PETN under a 5.4-grain detonator. The detonator contains 93.7 percent of lead azide and 6.3 percent of tetra-zene.

The aluminium adapter for the attachment of the magazine consists of a screwed ring with a stepped hole for the magazine holder. A rubber ring, to cushion the set-back of the arming sleeve, is fixed in a groove in the top of the adapter.

ACTION: With the arming sleeve supported on the retaining spring, the coiled spring strip prevents the striker spring being compressed and thus holds the neadle away from the detonator.

On acceleration the arming sleeve sets back on the rubber ring in the adapter and bends back the four arms of the retaining spring. Rebound of the sleeve is prevented by the arms entering the groove inside the sleeve. The coiled spring strip is then free to expand into the enlarged part of the body recess, leavin the striker supported only by the spiral spring.

On impact the striker is forced in and the needle pierces the detonator.

REMARKS: The fuze A.Z. 5095 is used in the nose of the German 8.8-cm A.Tk. Hollow Charge Rocket projectile. Except for the undermentioned difference, it is identical with the fuze 5075.

The body is made of steel.

The striker is made of black plastic.

The retaining spring supporting the arming sleeve has only two arms, in-stead of four, and these are thinner to permit the fuze to be armed at a much smaller acce-leration.

The spring holder is cut in two places to accommodate the arms.

The magazine holder, which is of steel, screws into the fuze body direct. The adap-ter has been omitted.

A safety pin is provided. This passes through the fuze body and a circumferential groove cut in the arming collar.

The weight of the fuze is 3.2 ounces. The diameter of the threads is 1.057 inches and the over-all lenght 2.12 inches.

Figure 562 – A.Z. 5095