Jack nuts are expandable, internally threaded fasteners designed for use in thin, soft, or brittle materials such as plastic, fiberglass, or sheet metal. Installed into pre-drilled holes, they collapse behind the panel as the screw is tightened, creating a secure, vibration-resistant anchor. Commonly used in automotive interiors, electronics, and light-duty assemblies, they provide reliable fastening without the need for rear access.

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