How to Use Steel Rivet Nuts?
Leading Rivet Nut Manufacturer and Supplier in China
Steel rivet nuts are essential fasteners for creating strong, threaded connections in thin or blind materials such as sheet metal, tubes, or enclosures. Whether you’re working in automotive, machinery, or construction applications, knowing how to use steel rivet nuts properly is key to ensuring reliable and durable assemblies. In this guide, we’ll walk you through the tools, techniques, and best practices to install steel rivet nuts correctly and avoid common issues.
Table of Contents
What Are Steel Rivet Nuts and Why Are They Used?
Steel rivet nuts are fasteners designed to create strong internal threads in thin-walled materials such as sheet metal, plastic panels, aluminum sheets, and more. They function similarly to rivets—installed by deformation to securely anchor the nut to the base material—while forming a standard internal thread that allows bolts or screws to be tightened into them.
Key Features and Advantages:
High Strength: Made from carbon steel or alloy steel, steel rivet nuts offer excellent tensile, shear, and torque resistance, making them ideal for high-load applications.
Blind Installation Capability: Can be installed from one side only, which is especially useful for tubes, closed profiles, or any structure where the rear side is inaccessible.
Efficient Assembly: No need for welding; fast installation makes them ideal for mass production and industrial assembly.
Versatile Compatibility: Can be securely installed in steel, aluminum, plastic, fiberglass, and other base materials.
Reusable Threads: The internal threads can be reused multiple times, making them suitable for assemblies that require regular maintenance or part replacement.
Thanks to these advantages, steel rivet nuts are widely used in automotive manufacturing, machinery, home appliances, rail transit, wind power equipment, and sheet metal fabrication. They provide a reliable and economical solution for situations where threading thin-walled structures directly is not feasible.
What Tools and Preparations Are Needed to Install Steel Rivet Nuts?
①. Common Installation Tools
Depending on the working environment and production scale, steel rivet nuts can be installed using a variety of tools. The most common options include:
Suitable for small-scale or occasional installations
Easy to operate; ideal for repair work, prototyping, or confined spaces
Requires manual force; lower efficiency and consistency
Powered by compressed air; ideal for medium-scale assembly tasks
Fast and consistent, reduces operator fatigue
Commonly used on factory assembly lines and in light industrial applications
c. Electric or Hydraulic Rivet Nut Tool
Best for large-volume, continuous operations
Provides precise torque control with adjustable settings for different rivet nut sizes
Suitable for industrial-grade applications like automotive manufacturing and appliance assembly
②. Preparations Before Installation
To ensure proper installation, certain checks and pre-treatments must be done before starting:
a. Confirm Thread Size
Determine the required rivet nut size (e.g., M4, M5, M6, M8) based on the design or drawing
Select compatible installation tools and matching bolts to ensure proper fit
b. Verify Base Material Thickness Is Within Grip Range
Each rivet nut model has a specified “grip range” (i.e., the thickness range of material it can securely fasten)
If the base material is too thin or too thick, it may result in a weak hold or installation failure
Example: A standard M6 carbon steel rivet nut typically has a grip range of 0.5 mm – 3.5 mm; for thicker materials, a long-grip version should be used
c. Select the Proper Hole Diameter
The hole diameter must match the rivet nut’s body size to avoid spinning, slipping, or improper seating
It is recommended to follow the manufacturer’s technical datasheet for optimal hole size
Example: The recommended hole diameter for an M6 steel rivet nut is 11.0 ± 0.1 mm; if the hole is too large, the nut won’t grip, and if too small, insertion becomes difficult or causes deformation
d. Inspect the Rivet Nuts Before Use
Check for cracks, deformations, coating damage, or other defects
Faulty rivet nuts are prone to breakage or thread stripping during installation, compromising the joint
It’s advisable to perform batch sampling inspections to ensure quality consistency
How to Use Steel Rivet Nuts?
1. Drilling Preparation
Drill Hole Matching: Begin by drilling a hole in the base material. The hole diameter must strictly follow the rivet nut’s recommended size. For example, an M6 steel rivet nut typically requires a 9.0 mm ± 0.1 mm round hole. For hex-shaped rivet nuts, a corresponding hexagonal hole is needed.
Chamfer and Deburr: Chamfer the edges of the hole and thoroughly remove burrs and cutting debris to ensure even force distribution and proper expansion of the rivet nut during installation.
Clean and Dry Hole Wall: Ensure there is no oil, rust, or debris inside the hole that could affect installation quality.
2. Mounting the Rivet Nut onto the Tool
Thread the Rivet Nut: Screw the steel rivet nut clockwise onto the tool’s mandrel or draw bolt until the rear end of the nut touches the tool head.
Ensure Alignment: Make sure the rivet nut is aligned perpendicularly with the tool to prevent eccentric installation, which could affect the plastic deformation at the tail end.
Set Pre-Tension: Some electric/hydraulic tools allow presetting of initial pull force to ensure consistent installation results.
3. Inserting into the Pre-Drilled Hole
Insert Vertically: Align the tool with the pre-drilled hole and insert the rivet nut vertically, ensuring it is fully seated in the hole.
Avoid Tilting or Misalignment: Improper angle can cause uneven deformation, poor grip, or damage to the hole wall.
4. Perform Riveting Operation
Activate the Tool: Squeeze the handle (manual) or press the button (electric/pneumatic). The tool will pull the mandrel, causing the rear end of the rivet nut to deform plastically and expand against the back of the base material.
Keep Stable: Avoid shaking or moving the tool during the process to ensure symmetrical expansion and a strong bond.
Reference Riveting Force: For an M6 steel rivet nut, typical pull force ranges between 5000 N and 7000 N, but always refer to product-specific data.
5. Remove Tool and Inspect
Unscrew Tool: After riveting is complete, rotate the mandrel counterclockwise or release the electric tool to detach it from the rivet nut.
Inspect Installation Quality:
Firm Fit: The rivet nut should sit tightly against the base material without looseness;
Proper Tail Expansion: The tail end should expand evenly in a circular shape, pressing firmly against the back of the material;
Thread Integrity: Insert a matching bolt to test if the internal thread is intact, aligned, and smooth without slippage;
Secondary Torque Test Recommended: For critical joints, use a torque wrench to verify that the clamping force meets design specifications.
What Should You Pay Attention to When Installing Rivet Nuts?
1. Choose the Right Rivet Nut Size and Hole Diameter
Selecting the appropriate rivet nut size and matching hole diameter is the foundation for successful installation and a secure connection. Consider the following factors:
a. Choose Based on Thread Size
Steel rivet nuts are typically sized by their internal thread (e.g., M4, M5, M6, M8, M10, M12). Choose the size based on the bolt to be used and the load requirements:
Light-duty structures: Recommended sizes M4–M6
Medium-load connections: Recommended sizes M6–M8
Heavy-load or structural applications: Recommended sizes M10–M12
For example, if the application requires inserting an M6 bolt, an M6-thread steel rivet nut should be used.
b. Match the Grip Range to Base Material Thickness
Each rivet nut has a specified grip range, which defines the base material thickness it can effectively clamp.
If the material is too thin, the rivet nut tail may not fully expand, resulting in a loose fit.
If the material is too thick, the rivet nut may deform or fail to install correctly, compromising structural safety.
Use a caliper to measure the exact thickness of the base material and confirm it falls within the grip range of the rivet nut.
c. Ensure Accurate Hole Diameter
The hole diameter is critical to proper installation. Refer to the manufacturer’s technical specifications for the correct diameter:
| Rivet Nut Size | Recommended Hole Diameter (mm) |
| M4 | 6.0 ± 0.1 |
| M5 | 7.0 ± 0.1 |
| M6 | 9.0 ± 0.1 |
| M8 | 11.0 ± 0.1 |
| M10 | 13.0 ± 0.1 |
| M12 | 15.0–16.9 |
- Oversized holes → Insufficient clamping force, potential loosening
- Undersized holes → Difficult insertion, risk of nut damage or tool jamming
- For hex rivet nuts, use pre-cut hex holes matching the nut’s dimensions.
d. Match Hole Shape with Anti-Rotation Features
- Round holes: Use knurled rivet nuts for added friction and anti-rotation.
- Hex holes: Use hex-body rivet nuts for mechanical locking and superior torque resistance.
- For soft materials (e.g., aluminum, plastic), anti-rotation features are especially important.
2. Ensure Smooth Hole Edges
- Always chamfer and deburr the hole edge to allow proper expansion and avoid thread damage.
- A 90°–120° chamfer angle is recommended to improve insertion and thread alignment.
3. Use the Proper Installation Tool
- For M4–M8 sizes, manual rivet nut guns are suitable for small-scale work.
- For M10 and M12, use pneumatic or electric rivet nut tools with sufficient pull force (M10 typically requires 6000–8000 N).
- Check the tool mandrel regularly for wear to avoid poor riveting or nut rotation.
4. Ensure Perpendicular and Stable Installation
- Keep the tool perpendicular to the base material to avoid tilting.
- Avoid tool movement during installation to ensure even expansion and secure clamping.
- After riveting, check that the head is flush with the surface and the tail is fully expanded.
5. Inspect Thread Integrity After Installation
a. Test with Standard Bolt
- Use a bolt with matching thread size (e.g., M6, M8).
- Insert the bolt slowly and vertically into the rivet nut.
- Check for smooth, resistance-free engagement with no jamming.
- If you feel “stripping,” sudden loosening, or poor engagement, the thread may be damaged.
b. Check for Thread Defects
- Misaligned threads: May result from uneven force or misaligned holes, causing improper engagement.
- Damaged threads: May occur during installation or bolt tightening, reducing load-bearing capacity.
- Stripped threads: If the bolt rotates freely without tightening, the thread is likely stripped or weak.
c. Check Tail Expansion
- Inspect the rear of the base material or use a probe to ensure even expansion of the rivet nut tail.
- If not fully expanded, the nut may become loose and compromise the joint’s reliability.
6. Consider Corrosion Protection
a. Why Is Corrosion Protection Important?
- Steel is prone to oxidation and corrosion when exposed to air, moisture, or chemicals (e.g., salt, acids).
- Corrosion degrades both appearance and mechanical strength, leading to thread failure, poor clamping, or breakage.
- For structural applications (e.g., outdoor installations, bridges, vehicles), corrosion failure can pose serious safety risks.
b. Common Corrosion-Resistant Finishes and Performance
- Zinc Plating
- Economical, silver or yellow appearance
- Salt spray resistance: 72–120 hours (NSS)
- Suitable for indoor or mildly humid environments
- Dacromet Coating
- High-performance non-electrolytic coating, matte gray finish
- Salt spray resistance: ≥ 500 hours (NSS)
- Ideal for outdoor, marine, and high-humidity environments
- Phosphate Coating
- Often used as a primer; dark gray finish
- Basic corrosion resistance, suitable for post-coating or oil-sealing applications
- Nickel/Chrome Plating
- Aesthetic appearance with good wear and corrosion resistance
- Ideal for products requiring both durability and visual appeal
c. Corrosion Protection Recommendations by Environment
| Environment | Recommended Coating |
| Indoor dry areas | Zinc plating |
| Humid indoor areas | Zinc or Dacromet |
| General outdoor use | Dacromet or Nickel |
| Coastal/high salt areas | Dacromet, Nickel, or Stainless Steel |
| Chemical/acidic plants | Dacromet or specialized coatings |
What Are Common Problems When Using Steel Rivet Nuts and How to Fix Them?
1. Rivet Nut Loosens After Installation
Symptoms: The rivet nut is not securely fixed after installation, showing movement, spinning, or even falling out during use.
Possible Causes:
- The installation hole diameter is larger than recommended, reducing clamping force;
- Insufficient pull force from the installation tool, causing incomplete expansion of the rivet nut tail;
- The tool is not aligned vertically with the base material, resulting in uneven force;
- The base material is too thin, making it hard to transfer clamping force effectively.
Solutions:
- Use the recommended hole diameter (e.g., 11.0 ±0.1 mm for M6 rivet nuts);
- Use high-quality riveting tools that provide stable and sufficient pulling force;
- Ensure vertical alignment during installation, and consider using a positioner or guide fixture if needed;
- Check that the base material thickness is within the grip range; if not, use long-grip rivet nuts for thicker materials.
2. Rivet Nut Spins or Slips During Use
Symptoms: When tightening the bolt, the rivet nut spins with it, preventing proper fastening and possibly damaging the base material.
Possible Causes:
- Loose fit between the rivet nut and the installation hole;
- Base material is too soft (e.g., aluminum or plastic) or has burrs on the hole edge, reducing friction;
- A smooth-body rivet nut is used, lacking anti-rotation features.
Solutions:
- Choose rivet nuts with anti-rotation designs, such as:
- Knurled body: increases surface friction;
- Hex body: locks mechanically into hex holes;
- Chamfer and deburr the hole edge to ensure smooth and flush contact;
- For soft base materials, consider reinforcing the hole edge with washers or metal sleeves;
- Control the tightening torque to avoid over-tightening and forcing the nut to spin.
3. Deformation of the Hole or Cracking of the Rivet Nut
Symptoms: The hole edge cracks or bulges; the tail of the rivet nut tears or the nut body breaks.
Possible Causes:
- Excessive pulling force during installation or improper stroke settings;
- Rivet nut grip range is smaller than the actual material thickness;
- Hole diameter is too small, causing difficulty during insertion and forcing damage;
- Poor-quality tools or excessive installation speed.
Solutions:
- Confirm the base material thickness and select a rivet nut with a matching grip range;
- Use electric or hydraulic tools with precise force/stroke control functions;
- Drill holes according to recommended diameters; avoid overly tight fits;
- Inspect rivet nuts before installation and avoid using products with pre-existing cracks or defects.
Where Are Steel Rivet Nuts Commonly Used?
1. Automotive Sheet Metal Assembly
- Steel rivet nuts are widely used in car body panels, chassis, engine compartments, and inner door panels for secure threaded connections.
- Especially suitable for structures that cannot be accessed from the backside, such as enclosed profiles or reinforcement beams.
- They withstand vibrations, impacts, and temperature changes during vehicle operation, ensuring the connection remains secure.
- Commonly used to fasten components like bumper brackets, engine guards, radiator mounts, and more.
2. Internal Threaded Connections in Industrial Control Cabinets
- In control cabinets, enclosures, and electrical panels, steel rivet nuts are used to mount electrical modules, rails, and support brackets.
- Ideal for creating durable thread holes in thin metal sheets (typically 1–2 mm thick).
- More reliable than self-tapping screws and allow repeated assembly/disassembly without damaging the base material.
- Common thread sizes range from M4 to M8, suitable for frequent installation and maintenance.
3. Reinforced Connections in Sheet Metal Fabrication
- In applications involving stainless steel or aluminum enclosures, multiple components often need to be joined or additional hardware installed.
- Steel rivet nuts create a clamping force through structural expansion, significantly improving load capacity.
- Useful where welding is not ideal due to deformation or heat sensitivity.
- Fast and easy to install without tapping, making them ideal for low- to mid-volume sheet metal assembly.
4. Architectural Metal Facade Systems
- Used in the installation of facade elements like aluminum panels, perforated sheets, and stainless steel cladding.
- Since these panels are typically 1.5–3 mm thick, direct tapping is not feasible.
- Steel rivet nuts provide durable threaded inserts, ensuring secure panel fastening.
- Maintain reliable clamping force even under long-term wind load and thermal expansion/contraction.
5. Wind Power Equipment Maintenance Ports
- Found in wind turbine nacelles, towers, and control units, especially in access doors, inspection hatches, and maintenance panels.
- Steel rivet nuts provide durable threaded joints for parts that need to be regularly opened for inspection.
- In harsh environments such as high-altitude or offshore locations, corrosion-resistant coatings (e.g., Dacromet) ensure long-term performance.
- Capable of withstanding exposure to wind, rain, and salt spray, helping to maintain the structural integrity of wind turbines.
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Conclusion
Steel rivet nuts, as high-strength and highly reliable blind fasteners, are widely used across industries such as automotive manufacturing, rail transit, mechanical equipment, building structures, and electrical control enclosures, thanks to their excellent tensile strength, shear resistance, and broad applicability.
Compared to aluminum or plastic inserts, steel rivet nuts maintain strong fastening performance even under demanding conditions such as heavy loads, high vibration, and extreme temperatures, significantly enhancing structural stability and safety. In addition, their diverse structural options—such as hex body, knurled body, closed-end, and long-grip types—combined with various anti-corrosion treatments (e.g., zinc plating, Dacromet, phosphating), give them outstanding environmental adaptability and engineering flexibility.
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