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Text copied from Bulletin#59 german hand- & riflegrenades, Mar.7 1944 :

Data: Overall length: 5.5inches, Maximum diameter: 1.2inches, Color: Black body, aluminium fuze & base, Total weight: 9ozs., Explosive filler: PETN/Wax, Weight of filler: 1.1ozs., Maximum range: 550yards, Delay: Self-destroying-11seconds, Friction igniter-4½seconds.


Description: This grenade consists of a body with explosive filling and detonator, a fuze body carrying the direct action fuze, a friction igniter, and a base fitment carrying the delay of the self-destroying system. The body is in the form of a steel tube having a diaphragm near the bottom. It is screw threaded at the nose to recieve the fuze body and at the base to recieve the base fitment. The diaphragm is screw threaded centrally to recieve the delay igniter. The filling is phentrite wax contained in a cardboard container. The explosive has a central cavity which holds the detonator encased in an aluminium container at one end, and recieves the igniter delay pellet from the diaphragm at the other end.



The fuze is made of aluminium and is of the direct action type. The base of the fuze body is threaded externally to enter the grenade body and internally to recieve the detonator (primer) holder. It consists of a striker held away from the primer by a creep spring and a coiled spring. Around the coiled spring is an inertia pellet resting on four fingers of a stirrup spring fixed in the base of a stirrup spring retainer. The inertia pellet has a groove out on the inside of it.
The friction igniter which is similar to the B.Z 24 used with stick hand grenades screws into the central channel of the diaphragm. The igniter pellet has a delay of 4½seconds.
The rifled base fitment is screw threaded externally to screw into the base of the grenade and internally at the base to recieve a closing plug. A 5½sec. delay pellet contained in a brass holder is situated in the base.

The propelling cartridge is a 7.92mm. cartridge closed at the shoulder by crimping. The propellant consists of 0.9gram of nitrocellulose flakes.



Operation: 1. As a rifle grenade- a)On discharge the inertia pellet of the fuze is driven downwards and the ends of the stirrup spring are forced into the grooves of the inertia pellet thus holding it down. The clock spring is now held in position by the collar of the striker pin and the stirrup spring retainer. On decaleration the clock spring flies outward, assisted by centrifigal force, into th recess in the fuze body. On impact the striker compresses the creep spring and penetrates the primer whose flash explodes the detonator. b) Should the fuze not function the grenade will be self-destructive. On firing the flash enters the hole in the closing plug and ignites the delay pellet which burns for 6½seconds. This then fires the friction igniter which will give an additional delay of 4½seconds and the fire the detonator.

Operation: 2. As a Hand Grenade- a)The base fitment is unscrewed and the cord of the friction igniter pulled. This gives a delay of 4½seconds and then fires the detonator.

**The text as copied above speaks of aluminium fuze and base. These exist too but steel fuze and bakelite bases are the most commonly used grenades during ww2.

Photos a good friend :





Below on the left : two different primers as fitted in the AZ5071 fuze.
Right: these are the paper labels on top of each H.E charge fitted in the grenades.
The labels are marked with designation, mfg code and lot number/year
.

Photos © Aitor Iriarte





The photo right shows the two types that could be used as a handgrenade.
The left one has a base that is pulled completely after unscrewing, the right one has the base unscrewed and then reveals a bakelite pull knob, leaving the rifled based as a useless part.

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The photos below are made by Andrew, NZ.
These riflegrenades have the threaded hole in the base BUT are plugged and cannot be used as a handgrenade.
The cut model on the photo was also plugged when found, like the other.
Does anyone know more on this variety?








Good suggestion by Sebastian :

The fuze could be the variety on the end of the war, as the oberkomando der wehrmacht changed their production in August 1944.
Both pyrotechnical self-destruction and hgr-pull fuze were no longer fitted.
The bodies that were already drilled and threaded might got plugged like the ones shown on Andrew's photos.


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Click HERE to see a small photoshoot of the grenade in Tamás' collection.

Markings:
Body: 44 AUZ 84n "eagle"
Fuze: AZ 5071 St 44 auz 190 ("eagle" M III/3)
Bakelite base: AY 10
Cardboard packing: CUY 43

Photos © Tamás.