How does a rivet nut gun work?
Rivet nut guns have three distinct methods for installing blind thread inserts:
- Spin‑spin
- Spin‑pull to pressure
- Spin‑pull to stroke
Spin‑spin rivet nut guns:
Spin‑spin rivet nut guns use air pressure to spin the chuck, or mandrel, of the gun. As the mandrel spins, it draws the body of the insert in. This action collapses the wall of the rivet nut, securing it to the desired substrate. Once the threaded insert is installed, the mandrel reverses its rotation to separate from the fastener. This style of rivet nut gun requires awareness from the operator as to not over‑tighten the rivet nut.
Spin‑pull to pressure rivet nut guns:
Spin‑pull to pressure rivet nut guns install the fastener based on a pre‑set pressure determined by the operator. The rivet nut is threaded onto the mandrel, which retracts, pulling the threads of the fastener into the parent material until a pre‑determined pressure is achieved. Pull to pressure installation is ideal for parts with variable material thickness.
Spin‑pull to stroke rivet nut guns:
Spin‑pull to stroke rivet nut guns install the fastener based on a pre‑set stroke length determined by the operator. The rivet nut is threaded onto the mandrel, which retracts, pulling the threads of the fastener into the parent material until a pre‑determined stroke is reached. Pull to stroke installation is ideal for parts with a uniform material thickness.