reagointipään

reagointipään is a Finnish term that translates to "reaction head" or "response head." It is most commonly used in the context of explosives and firearms, referring to the component within a firing mechanism that initiates a reaction. This reaction is typically the detonation of a primer charge, which in turn ignites the main propellant.

In firearms, the reagointipään is part of the firing pin assembly. When the trigger is pulled, the firing pin, often driven by a spring, strikes the primer of the cartridge. The impact energy deforms the primer cup, crushing the sensitive explosive material inside, causing it to detonate. This ignition then spreads to the gunpowder in the cartridge case, propelling the projectile.

The design and functionality of a reagointipään can vary significantly depending on the type of firearm and its firing mechanism. For example, it might be a simple projection on the firing pin itself, or a more complex lever or hammer mechanism designed to deliver a specific type of impact. The precise timing and force of the reagointipään are critical for reliable weapon function.

Beyond firearms, the term can occasionally be used in other technical contexts where a specific component is responsible for initiating a chain reaction or response. However, its primary and most prevalent meaning is within the realm of ordnance and shooting.