How Strong Are Rivet Nuts – And When Should You Use Them?

ByJim Boslice Metalworking & Fabrication

Rivet nuts (or nutserts) provide reliable, permanent threaded inserts in thin materials where traditional tapping is impossible. While they offer excellent pull-out resistance, their strength depends primarily on the material thickness, the fastener’s diameter, and the quality of the installation.

You have probably encountered a project where you needed a solid, machine-threaded hole in a thin piece of sheet metal. Perhaps you were building a custom rack for your van or securing a bracket to a thin-walled steel tube, only to realize that a standard bolt and nut weren’t an option. You might have wondered, how strong are rivet nuts in these specific, high-vibration environments?

This is a common hurdle for home metalworkers and garage tinkerers alike. Using the wrong fastener can lead to a loose connection that rattles, degrades, or fails completely under stress. Understanding the mechanical limits of these fasteners will give you the confidence to move beyond simple sheet metal screws.

In this guide, we will break down the structural capabilities of rivet nuts, how to select the right material for your project, and the best practices for a professional-grade installation. By the end, you will know exactly when to rely on these versatile hardware pieces and when you might need to consider a different approach.

Understanding How Strong Are Rivet Nuts in Real-World Applications

To determine how strong are rivet nuts, we have to look at the two primary failure modes: pull-out strength and spin-out torque. Pull-out occurs when the axial force causes the fastener to rip out of the parent material, while spin-out happens when the fastener rotates in the hole under tightening pressure.

Generally, a properly installed steel rivet nut in 1/8-inch steel plate can withstand hundreds of pounds of direct pull force. However, this is not a one-size-fits-all metric. Your installation is only as strong as the metal you are fastening it into.

The Role of Material Thickness

The thickness of your base metal is the most critical factor. If the metal is too thin, the rivet nut will lack the necessary surface area to grip, leading to premature failure. Always check the manufacturer’s grip range specifications before you begin your project.

Steel vs. Aluminum Rivet Nuts

Choosing the right material is just as important as the size. Steel rivet nuts offer the highest tensile strength and are ideal for structural automotive or workshop projects. Aluminum, while lighter and easier to install, is better suited for non-structural decorative panels or lighter loads where corrosion resistance is the priority.

Factors That Influence Fastener Performance

Even the strongest fastener will fail if the preparation is poor. Many DIYers overlook the importance of the hole size. If your hole is too large, the rivet nut will not deform properly during the setting process, resulting in a loose fit that lacks structural integrity.

  • Hole Precision: Always use a high-quality drill bit and deburr the edges. A clean, tight hole is essential for a secure, tight-fitting rivet.
  • Setting Tool Quality: A hand-pumped rivet gun might work for small projects, but a professional-grade setting tool ensures consistent compression every time.
  • Application Environment: Consider vibrations. If your project is mounted to a vehicle or a piece of vibrating machinery, use a medium-strength threadlocker to prevent the bolt from backing out over time.

How to Avoid Common Installation Pitfalls

One of the biggest mistakes beginners make is over-tightening or under-tightening the fastener during the installation phase. If you do not compress the rivet nut enough, the bulb on the backside will not form fully, and the insert will simply pull out of the hole when you tighten your bolt.

Avoiding Spin-Out

If you find that your rivet nuts are spinning in the hole, you have likely oversized the drill hole or failed to properly set the fastener. For high-torque applications, consider using hex-body rivet nuts. Because they are shaped like a hexagon, they physically lock into the hole and are virtually impossible to spin, even under high pressure.

Checking Your Work

Before you commit to a full assembly, test one on a scrap piece of the same gauge metal. Try to pull it out or spin it with a wrench. This “proof test” is a hallmark of an experienced builder and saves you from having to repair a mistake later.

Essential Tools for the Workshop

You don’t need a massive workshop to install these, but having the right tools makes a world of difference. At a minimum, you need a reliable hand-rivet setter and a set of quality drill bits. If you do a lot of metalwork, upgrading to a pneumatic or cordless electric setting tool can significantly reduce hand fatigue and improve consistency.

When selecting your hardware, always buy from reputable suppliers. Cheap, imported fasteners often use inconsistent alloys, which makes it impossible to predict how they will react to the stress of the setting process.

Frequently Asked Questions About Rivet Nuts

Can I reuse a rivet nut after it has been set?

No, rivet nuts are designed for one-time installation. Once they have been crushed and deformed to lock into the panel, they cannot be removed and reused. If you make a mistake, you will need to drill it out and install a new one.

What should I do if a rivet nut spins in the hole?

If it is already installed, you can try to tighten it further with the setting tool to see if the bulb expands enough to grab the material. If that fails, you will need to carefully drill the head off the fastener and replace it with a new one.

Are rivet nuts stronger than self-tapping screws?

In almost every case, yes. While self-tapping screws rely on the threads they cut into the sheet metal, rivet nuts create a mechanically locked flange that provides significantly more surface area and superior pull-out resistance.

Do I need to worry about corrosion?

Galvanic corrosion can occur if you use an aluminum rivet nut in a steel panel, especially in outdoor environments. Always try to match the material of the fastener to the material of the base metal to prevent long-term degradation.

Final Thoughts on Mastering Your Fastening Techniques

Learning how strong are rivet nuts is really about understanding the partnership between the fastener and your base material. When used correctly, they are an incredibly robust solution for creating threaded connections in thin materials that would otherwise be impossible to work with.

Start small, test your technique on scrap metal, and don’t be afraid to invest in high-quality hardware. Once you get the hang of the process, you will find yourself reaching for these versatile fasteners for everything from garage organization to custom automotive builds. Keep your shop safe, keep your measurements precise, and happy building!

Jim Boslice
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