Data

Overall length		29-1/8 inches.
Length of stick		16-7/16 inches.
Length of body		12-1/4 inches.
Total weight		10 lbs. 12 oz.
Weight of filler		5 lbs. 5 oz.
Explosive filler		Dinitro anoline with T.N.T.
Base Fuze		Bd.Z. 5130.
Point Fuze		A.Z. 5075.

Description

The complete round, which is made up of the hollow charge stick grenade and the propellant, is fired from the 3.7 cm. P.A.K. gun.

The stick grenade has a steel rod which fits into the bore, and a concentric perforated sleeve which fits around the barrel of the gun. A pressed steel cap forms the nose of the grenade giving it the required standoff distance. The hollow charge is at the rear of the steel cone and consists of two blocks of dinitro anoline with T.N.T. Two detonators are set in the base of the grenade, one facing in each direction. A nose fuze of the instantaneous percussion type and a tail fuze also instantaneous are present.

The steel rod which fits into the bore of the gun is a hollow tube closed at the base end. The base fuze is a percussion type fuze very sensitive to shock. It is armed by setback which releases a spring loaded detent allowing a steel ball to move away from the striker. Upon impact the striker moves forward against the action of a very weak creep spring.

The nose fuze 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 bites of a stirrup spring retainer. The inertia pellet has a groove cut around its internal circumference.

Two detonators are located in the base of the main charge. One detonator faces toward the nose fuze to receive the flash from there, and the other detonator faces the tail fuze to receive its flash.

The propelling charge is contained in a steel cartridge case. The charge consists of diethylene glycol dinitrate tubular stick powder with an igniting charge of nitrocellulose granular powder, and a percussion type primer consisting of mercury fulminate and black powder.

Operation

On discharge the inertia pellet of the nose 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 deceleration the clock spring flies outward, assisted by centrifugal force, into the recess in the fuze body. At the same time the base fuse is being armed. In the event of direct impact the nose fuze will function the grenade, but in the event of graze action, the base fuze will function the grenade.