Captive fastener

Captive fasteners are an engineered class of fastener designed for a permanent hold (captivation) within a target assembly or housing, including upon servicing. They provide a secure joining, and avoid fastener loss or damage that might be caused by a loose part.

Many captive fasteners use thread locking, press-fitting, or broaching to accomplish their anchor-hold within the larger assembly housing. However, some captive fasteners meld with the material into which they are joined, either through cold forming or welding.[1][2]

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