Spring plunger

A spring plunger or detent spring is a spring-loaded mechanical part to ease indexing, positioning, securing, and disassembling of objects without losing parts. The spring force keeps the pin in position during normal use.

Typically, it is a machine part consisting of a hollow cylinder with an internal compression spring acting on a pin. The pin may, for example, be shaped as a rod with either a cylindrical or rounded tip (broadly categorized as a spring plunger), or a spring-loaded ball (ball plunger) if the spring acts against a ball.

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