What component of the grenade is primarily responsible for detonation?

The primary component of a grenade responsible for detonation is the fuze. The fuze serves as the triggering mechanism that ignites the explosive filler once the grenade is deployed. It typically includes various safety features to prevent accidental detonation, and it is often designed to initiate a delayed explosion after the grenade has been thrown, allowing the user time to seek cover.

The other components, such as the body, filler, and safety pin, play different roles. The body serves as the container for the filler and protects it during handling and transport. The filler is the explosive material itself, which creates the blast effect upon detonation. The safety pin, on the other hand, is a safety feature that prevents the fuze from being activated until it is removed, ensuring safe handling prior to use. Each part is essential for the grenade's overall function, but the fuze is key to initiating the explosive action.