How to Install a Rivetnut
A rivetnut creates a threaded fixing point in material that may be too thin to tap directly. It is installed from one side using a compatible setting tool, making it useful for sheet metal, tubing and components with limited rear access.
This guide outlines the general process. Always follow the instructions for your specific rivetnut and installation tool, as hole dimensions and setting parameters vary between products.
Before you start
Confirm the thread size, insert material, head style, body shape and grip range. The grip range must include the thickness of the material at the installation point. Check that there is enough space behind the component for the insert to set.
Tools and equipment
- A rivetnut setting tool compatible with the insert size and material.
- The correct mandrel and nosepiece.
- Equipment to prepare the specified hole shape and dimensions.
- Suitable deburring equipment.
- Appropriate eye protection and any other protective equipment required for the work.
1. Prepare the hole
Prepare the hole to the dimensions and tolerances in the insert manufacturer's technical data. Do not choose a drill size from the thread size alone: inserts with the same thread can require different holes.
Round bodies require a circular hole, while hexagonal bodies require the specified matching hole shape. Deburr as instructed without enlarging the hole or adding an unspecified chamfer. Secure the workpiece before drilling and check for hidden wiring, pipes or other components.
2. Set up the tool
Fit the correct mandrel and nosepiece, then adjust the tool using the manufacturer's instructions. Depending on the tool, this may involve setting stroke or pulling force. Check settings on a sample of representative material before working on the finished component.
3. Load the rivetnut
Thread the rivetnut onto the mandrel to the engagement specified by the tool manufacturer. It should engage smoothly without cross-threading. For closed-end inserts, ensure the mandrel does not bottom out.
4. Position the insert
Place the insert into the prepared hole and seat its head against the surface as intended for that head style. Hold the tool square to the workpiece. Do not force an insert into an incorrectly sized hole.
5. Set the rivetnut
Operate the tool according to its instructions. The tool draws the threaded section towards the head, deforming the body behind the material to retain the insert.
Avoid under-setting or over-setting. Too little setting can leave the insert loose; excessive setting can damage the insert, threads, tool or parent material.
6. Remove the tool and inspect
Release and unthread the mandrel as instructed. Check that the head is seated correctly for its design, the insert is secure and the thread is undamaged. If the insert is loose, rotates or shows damage, investigate the cause before using the fixing.
7. Fit the bolt or screw
Use a fastener with the correct thread and suitable length. Ensure adequate thread engagement and clearance; a bolt must not bottom out in a closed-end rivetnut. Tighten to the value specified for the complete joint, not simply a generic torque for the bolt size.
Common installation mistakes
- Using an incorrect hole size or shape.
- Selecting a grip range that does not include the material thickness.
- Using the wrong mandrel, nosepiece or tool capacity.
- Holding the tool at an angle.
- Under-setting or over-setting the insert.
- Using an unsuitable bolt length or excessive tightening torque.
Check performance for your application
A correctly selected and installed rivetnut provides a threaded fixing suited to its specified application. Confirm performance using the manufacturer's technical data and tests in representative material. Load-bearing or safety-critical applications require appropriate technical assessment.
Need help choosing an insert or tool?
Contact Rivetnut Technology Systems with your thread size, material type, material thickness and application details to discuss suitable options.