The BZ39Nb was a friction fuze used on the Nb.Hgr39.
It was slightly different from the BZ39, which was used on the HE-stickgrenade.
The threaded adapter that screwed into the grenade body had holes drilled around the side to relief the pressure upon igniting. Without these holes, the fuze-well could burst.
These fuzes were used with igniter tube N4.
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