Definition & Meaning of "tightening key"

What is a "tightening key"?

A tightening key is a tool used to tighten or adjust bolts, screws, or fasteners. It typically has a handle and a head with specific shapes or sizes that fit different fasteners. The key is turned to apply force, which secures or loosens the fastener. Tightening keys are commonly used in mechanical work, construction, and putting together furniture or machinery.