Spin-pull riveting

Blind rivet fasteners are installed by axial pulling force. Alternatively, rivet nuts or clinch nuts in combination with a spacer are used.

In spin-pull riveting as a joining process, the blind rivet fastener is screwed on a thread and inserted into the pilot hole before the installation process. Subsequently, the blind rivet fastener is exposed to pulling force via thread. This results in deformation of the blind rivet bulge on the rear side of the metal sheet. A form-fit joint between the blind rivet fastener and the part is created. With the completion of this process, the pulling mandrel is spinning out. The assembly position only has to be accessible from one side. The part should have a corresponding pilot hole.

Spin-pull process for rivet nuts and clinch nuts

High-strength structural connection of a nut and spacer for one-sided accessible assembly positions

In many cases, a blind rivet nut does not meet the expected strength requirements for the subsequent screw joint. A better solution for high load-bearing joints is found in rivet nuts and clinch nuts, combined with a washer or spacer. Rivet nuts and clinch nuts handle significantly higher loads due to their larger diameter and height. For thicker metal plates, the combination of nut and spacer is recommended. This joint handles much higher loads than the formed blind rivet bulge.

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