Type 10 grenade
Type 10 grenade
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Type 10 grenade

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Type 10 grenade

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Type 10 grenade

The Type 10 grenade (十年式手榴弾, Jyūnen-shiki Teryūdan) was the first fragmentation hand grenade designed and deployed by the Imperial Japanese Army.

After the Russo-Japanese War of 1904–1905, the Japanese army experimented with a variety of grenades; however, no design reached mass production.

Japanese military observers in the European front of World War I noted the technical development and tactical application of hand grenades as infantry support weapons with considerable interest.

The Army technical bureau was tasked with a project to develop a grenade launcher that could be used in combination with the Type 38 rifle, the Japanese Army's standard infantry weapon.

The project failed for a variety of reasons, including too small a bore, too long a gun barrel and difficulties with a propellant. The technical bureau then turned to a World War I-vintage German design for a small signal mortar, which was developed into the stand-alone Type 10 grenade discharger.

The Type 10 grenade was designed for use with this grenade launcher when attached to a base containing a primer and propellant charge. It could also be thrown by hand, or fired from a rifle grenade launcher with a tail assembly added.

The design of the Type 10 grenade was almost identical to the later Type 91 with a grooved, "pineapple-shaped", segmented body designed to disperse sharp fragments when it exploded.

The main difference was the Type 10's serrated top. A threaded socket in the bottom of the body allowed for the attachment of an auxiliary propellant canister for use in a grenade launcher, or a finned tail assembly for use as a rifle grenade.

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