A spring plunger or detent spring is a spring-loaded mechanical part used for indexing, positioning, and securing of objects,[1] as well as for making objects possible to disassemble in normal use 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.[2][3] The pin may, for example, be shaped as a rod with either a cylindrical or rounded tip (broadly categorized as a spring plunger[4]), or a spring-loaded ball (ball plunger[4]) if the spring acts against a ball.
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