Category Archive: Rivet Nuts

Rivet Nut Flanges: What Flange Works Best For You?

By Frank Genovese, Applications Engineer

There are dozens of different body styles of rivet nuts on the market today, including-body, half-hex, and full-hex in shape with further variations to explore from there. However, for as many different body styles, there are also a wide variety of rivet nut flange types as well.

Standard flange types are typically round, large, and vary in thickness depending on whether or not the part is considered “heavy duty” or not. However, in applications calling for more flush installations to the installation pane, smaller (and thinner) flanges are offered as an alternative. For half-hex and full-hex parts, these flanges often take a hexagonal shape.

This heavy duty round rivet nut has a thick flange to prevent pull out

For increased spin-out resistance, hexagonal body styles are generally the optimal solution. This requires the ability to create hexagonal holes in your material to ensure a proper installation. If this choice is not available to you, there are flange features that assist as well. Many standard parts are also offered with wedges under the flange, which bite into the material.

This FHK hex-style rivet nut has a very small flange, but offers superior protection from spin-out

For harder materials that may prove more difficult to bite into, select series of rivet nuts come with a keyway under the flange, which provide another method to further lock the rivet nut into the material after it has been installed. However, the latter method does require the ability to create a corresponding allowance for said keyway in your installation pane.

a keyway under the flange helps the grip in this military grade rivet nut

So what’s your choice?

While many flange styles are designed for particular intent, they also contain their drawbacks, so be sure to consider trade-offs when determining your specific needs.

Standard large flanges offer suitable strength, but do not offer flush installation without any further processing. Small flanges provide more flush installation, but decrease parts’ resistance to push-out failure conditions – for an improved flush installation without this issue, countersunk-head rivet nuts are a choice, but also require the ability to process countersunk heads in your material. Wedged heads are ineffective in harder materials, while keyways require further precise processing of your material to fit the part.

While the number of choices may be staggering at times, it all comes down to the critical needs of your overall design. And, of course, for larger solutions, custom designs that deviate away from standard options to fit your exact geometric or performance needs are often viable. This may include modifications to the wideness or the thickness of the flange, or the addition of features like wedges or keyways.

If you’re ever unsure as to what style of flange is best for your specific needs, our engineers are always happy to answer your questions on design or test solutions to find the optimal fit.

Made in America Rivet Nuts

Did you know Sherex Fastening Solutions is a Made in America Fastener Company?

Our manufacturing plant in Akron, Ohio makes millions of American made rivet nuts, compression limiters, and inserts for composites every year. Our parts out of Sherex Akron belong in some of the hottest vehicles on the road today, dozens of commercial and military aircraft, general industrial applications, and department of defense products. In fact, our Made in the USA rivet nuts were relied upon when companies pivoted to make products that helped mitigate the spread of the coronavirus, like hand sanitizer and ventilator stands, along with other critical applications for hospitals.

Some of our most popular rivet nut lines are produced out of Sherex Akron, including our CAT and CFT Series, NAS Series, and custom rivet nuts and fasteners.

The CAT style rivet nuts has a low profile flange and can fit into a variety of different material thickness and material. This rivet nut could be a one fit solution if the material you’re looking to fasten has different thickness.

CAT Style Rivet Nut from Sherex

CAT Series Rivet Nuts

All NAS style rivet nuts are also made from our Sherex Akron location. The United States Department of Defense relies on Sherex NAS/MS rivet nuts for a variety of applications.

Our inserts for composite product line is used for structural attachments in plastic applications and are used extensively in the automotive and heavy truck industries as customer drive light weighting initiatives by switching to composite material for their components. In addition, Sherex adds compression limiters to these applications to ensure the mating component is not damaged due to the compressive force of the fastened joint.

NAS Style Rivet Nuts

NAS Style Rivet Nuts

Also, most custom rivet nuts are made out of Sherex Akron. With our staff of engineers and manufacturing facility, we’re able to see custom, American made rivet nuts from the design and manufacturing process all the way through quality control.

More upgrades are being made to the facility planned in 2020 to help increase capacity as demand as our Made in America rivet nut products continues to grow. More to come from Sherex Akron!

Sherex Rivet Nuts – Small Parts Playing a Big Role in Fighting COVID-19

This was something no one saw coming. A pandemic that would shake up life for everyone around the world. As fast as the virus spread, families and businesses had to transition faster.

Manufacturers went from making cars to ventilators, t-shirts to masks, vodka to hand sanitizer, and we thank every single one of those businesses for it. The country, the world needed it  – and Sherex is glad we could do our part to help.

Sherex Fastening Solutions went from supplying rivet nuts to some of the hottest new vehicles on the planet, to prioritizing its rivet nuts to manufacturers making products that make a direct impact in helping the world navigate through the COVID-19 pandemic. In total, four different rivet nut products went into applications that either directly helped patients or mitigated the spread of the virus.

Sherex’s rivet nuts went into were ventilator stands, hand sanitizers stands, and other critical applications used by hospitals.

“As an essential business, we have a duty to prioritize our products that will help fight this pandemic,” said Sherex president, Adam Pratt. “We’re happy knowing we can say, ‘hey our parts are in this application – we were able to help.’”

Sherex Akron, Sherex’s US manufacturing plant in Akron, Ohio, had an urgent requirement to produce these parts in short time. One of the parts Sherex Akron produced, part No. SXA25-80SPCA, is a flat head, open ended, smooth body rivet nut that installs into a stand specifically designed to hold up a ventilator. The customer was already using the part, but needed more, and needed them fast.

Ventilators are being used as a critical life saving device during the pandemic.

A more common Sherex part, part No. CAL2-580-3.3, is a knurled body rivet nut that belongs in a lot general industrial applications like refrigeration, heating and cooling units, and are used in the automotive industry. Now, they’re also used to create stands for hand sanitizers that will be used at malls, stadiums or any place with large gatherings so people will have ease of access to washing their hands.

The initial order of 30,000 rivet nuts was sent to the customer almost as fast as it was ordered.

Why are rivet nuts used and not typical nut and bolt? All were blind applications, meaning the attachment point could only be reached from the front – making it impossible to attach a nut to the backside of the bolt to keep the bolt secure. Also, efficiency. Once the rivet nut is installed, you just tighten the screw to attach your piece. Other methods are more time consuming, and during this pandemic, time is crucial.

“It felt good knowing that we could help and I know our employees had a sense of pride knowing they were helping too,” Sherex president Adam Pratt said.

Collaboration and Line Walks Key to Supplier and Distributor Sales Growth

By Steve Urhausen, President, All American Systems

For real and meaningful sales growth to take place, collaboration, cooperation and trust between the supplier and the distributor is extremely important.

This is why line walks and joint sales visits with supply chain partners at the end user are so vital that they are included in distributor rebate and purchase agreements.  This allows both the distributor and supplier to get a better understanding of the project, processes, and to solve problems the end users are seeking help for.

Unfortunately, this doesn’t happen as often as it should. Distributors will often go to their supplier for a solution without providing all of the necessary detail to find the best solution. If suppliers don’t know the end product, that typically means the solution they provide is based on the limited information that has been provided to them.

Understanding that there is confidential information, it is quite common for us to execute non-disclosure agreements to work towards an improved solution that benefits all parties involved.

When working with a distributor at an OEM during a line walk, I witnessed a cumbersome assembly for a rivet nut, with the installer reaching for a machined washer to put under the head of the rivet nut prior to the installation. The washer served to raise the head of the rivet nut up just enough that the gasket which was applied to this outdoor housing would not be crushed during final assembly.

Sherex Custom Rivet Nut

Because of a line walk, over 600,000 of this custom rivet nut have been used to  help the end user save time and money.

Looking for a better solutions and explaining the details to the Sherex team, they were able to manufacture a taller profile head that acted as a spacer in the application thereby eliminating the extra machined washer. This saved cost, the need to manage another part number, increased throughput on that assembly line, and reduced worker fatigue. This resulted in over seven years of sales with over over 600,000 parts sold.

Real sales growth occurs for both parties when the supplier and distributor work together to improve an assembly method or fastener joint resulting in the lowest total installed cost and improved performance of the end product. Both the supplier and distributor gains the respect of the end user, more profit, and more opportunities for additional projects. This improves and solidifies the supply channel while elevating sales experience above the “commodity mentality.” Win-Win!

Steve UrhausenAbout Steve Urhausen:
Steve has 43 years in the fastener industry and 25 years as owner of All American Systems.  His work experience with importers, distributors, and manufacturers has helped him understand the “right fit” philosophy when trying to match a supplier to a customer. As a sales manager of two different companies, Steve was exposed to sales reps where he learned to respect and appreciate the value that they brought to suppliers and customers. Over the last 25 years as an independent rep has taught him humility, the value of hard work, and that follow through and communication are critical to success!


Watertight Rivet Nuts

In an earlier post we talked about how corrosion should be considered when choosing the type of rivet nut to use in your next project, and what types of sprays can help deter or limit the pace of red rust and white rust from occurring.

Now water will certainly speed up the corrosion process, but that shouldn’t eliminate the use of rivet nuts in wet conditions, or conditions where a rivet nut will spend some of its life submerged in water or fluid.

Our partner Tubtara® has a few different watertight and fluid proof rivet nuts that are designed with seals underneath the flange to keep water and fluids from leaking through the rivet nut. Tubtara’s Watertight HX series feature a O-ring seal mounted underneath the flange, and provides protection against moisture, oil, and dirt under high pressures. Despite the O-ring, it will deliver a metal to metal contact after installation.

Tubtara Sherex Watertight HX

Tubtara Watertight HX Rivet Nut. Notice the O-ring seal underneath the flange.

The Watertight (H)DPX Series is a rivet nut that has an applied sealant underneath the head. This non-reactive seal is resistant to many auto oils, antifreeze and other kinds of fluids with a higher viscosity. The seal in the (H)DPX Series can come in a variety of different seal material including NBR, Viton, silicone, epoxy based, acrylate and polyurethane resin.

Tubtara Sherex HDPX Rivet Nuts

Non-reactive seal is great for use in high viscosity fluids

Any application where you wouldn’t want water or fluid to leak underneath or through the rivet nut should require a watertight rivet nut. Without using one of the seals, whether it’s an O-ring or sealant, it may not be completely watertight – especially as corrosion begins to develop.

For more information on watertight rivet nuts, or if looking for a solution for fasteners that will perform well under water or fluid, contact us!

Spin-Spin vs. Spin-Pull Rivet Nut Tooling

When it comes to rivet nut tooling, there are a variety of different options. While small-volume applications may often result in a manual hand tool being the best choice, larger-volume installation projects may require more robust tooling. Two of the most popular non-manual options are air-powered tools that install rivet nuts through either a spin-spin and spin-pull action.

Let’s go through the differences between spin-spin and spin-pull rivet nut installation tools.

Spin-Spin Rivet Nut Tool

A spin-spin rivet nut tool is an air-powered tool that, once a rivet nut is secured onto it, utilizes torque to spin its mandrel inward in order to collapse the rivet nut. The torque, driven by an air motor, ramps up continuously until the rivet nut fully collapses. After installation, the tool’s reverse trigger must be pressed to separate the tool from the now-installed rivet nut. In order to both maintain tool integrity as well as ensure proper installations, it is recommended that spin-spin mandrels be lubricated with wax.

The benefit of using spin-spin tools is that they are less expensive than spin-pull and can often be more lightweight, but its capabilities aren’t as complete as the spin-pull tool.

The installation base material can vary in thickness, but it is recommended that the rivet nuts being installed are thin-walled steel, aluminum or brass. Also, depending on what kind of spin-spin tool you purchase, it may often be limited in the thread sizes it can install. For instance, Sherex’s SSG-802 spin-spin tool is capable of installing parts with #10, ¼”, M5, and M6-diameter threads, and the SSG-803 is capable of installing 5/16”, 3/8”, M8, and M10-diameter threads. A hydro-pneumatic spin-pull tool is capable of installing all sizes between M3 to M10.
For a job that is consistently is going to use one part and one size, a spin-spin rivet nut tool would be a solid recommendation for the price.

Spin-Pull Rivet Nut Tool

A spin-pull rivet nut tool installs rivet nuts by pulling back its mandrel, rather than spinning it back. The rivet nut spins itself on to the mandrel, and then the mandrel pulls the threads of the rivet nut on to the base material, installing the rivet nut. The tool then spins the opposite way to release installed rivet nut. This tool is also referred to spin-pull-spin as explained in the two sentences before.

Sherex’s Flex-5 line of spin-pull tools is hydro-pneumatic, as the tool uses air and oil to install the part. A spin-pull tool can install everything that a spin-spin tool can, as well as more heavy-duty rivet nuts like full-body hex-style rivet nuts, European body styles, and stainless steel parts.

Another benefit of using a spin-pull tool is that it can install a wide range of thread sizes – from M3 through M10 for metric sizes, and from #4-40 to 3/8”-24 for inch sizes. You would need three different spin-spin tools to install that thread range!

For a job that is consistently is going to use one (compatible) part at one size, a spin-spin rivet nut tool would be a solid recommendation for the price. A spin-spin tool may be heavier and more expensive, but it is a far more versatile tool that can install more styles and more sizes of rivet nuts. All that is needed – for either tool – is the appropriate headset for the thread size you are trying to install.

Need help deciding between a spin-spin tool and a spin-pull tool for your next project? Contact us!

Rivet Nut Corrosion Protection

By Frank Genovese, Applications Engineer, Sherex

There’s always peace of mind knowing that a correctly installed rivet nut is the end of your concerns.

However, there is more to a properly installed rivet nut to ensure its success.

Your rivet nut will be exposed to the outside world of air and moisture, or it may reside in an environment where the piece will be subject to many bumps and scratches throughout its lifetime. While correctly installing the rivet nut is vitally important to its success as a fastener, there’s one more consideration you have to combat when it comes to rivet nut installation —  corrosion.

Corrosion protection for rivet nuts is vitally important when it comes to ensuring the rivet nut will be successful, and there are many ways to combat corrosion.

First, what is corrosion? Corrosion is a surface oxidation process that appears, mainly, in two forms: white rust and red rust.

White Rust a white powder composed of zinc oxide, which eventually coats portions of a surface containing zinc such as the protective layer of zinc-based plating that coats many rivet nuts.

This corrosion does not directly harm the structural integrity of a piece, but makes the piece more vulnerable to a more compromising form of corrosion — red rust, referred to by many as simply “rust.”

Red rust is an iron oxide that physically eats away at the base iron that composes your piece.

So how do you ensure optimal corrosion protection?

Look for rivet nut offerings that are stress-tested with a “salt-spray” test, which subjects rivet nuts to heavy abrasion until rust appears. Rivet nuts coated in a zinc plate with trivalent chromate, which must, at minimum, withstand 96 hours in a salt-spray test before white rust appears with red rust not appearing for another 240 hours. Zinc plate with trivalent chromate comes in clear, yellow, or black options.

For higher corrosion protection, zinc-nickel platings can achieve white-rust times of up to 144 hours minimum, as well as red-rust times of up to 1,200 hours.

If you have rivet nuts that only come in a trivalent plating, a strip and re-plate operation is possible to obtain the plating that best suits you.

The very best option when it comes to corrosion resistance is stainless steel. Stainless steel, though, can be difficult to install so make sure you have the proper tooling to ensure your stainless steel rivet nuts can be installed properly.

If you have any questions regarding which plating or material solution fits your application best please contact us! We are more than happy to give you the information necessary to make an informed decision.

Why Rivet Nuts?

Rivet nuts are becoming more and more popular every year. We would know – we manufacture them.

Their ease of use, high shear and tension strength, and lightning fast installation times are upgrades over traditional bolt and nut, and weld nut applications.

Rivet Nuts

Rivet Nuts come in a variety of styles


Installed Rivet Nuts

Installed Rivet Nuts

A main strength of rivet nuts are that, just like with traditional rivets, they are blind. Meaning, these fasteners can be installed securely from one side of the work piece. No need to struggle to reach around the back of the bolt to fasten the material with a nut. Once the rivet nut is installed, fasten your material through the rivet nut with any compatible externally threaded fastener and you’re all set.

The rivet nut itself can be installed into a variety of a different materials including metal, plastic, fiberglass and carbon fiber. It is used in a wide array of applications in the automotive, heavy truck, and manufacturing industries as they move toward making their products both lightweight and easier to make. In your vehicle, there are likely dozens of rivet nuts for all of the reasons stated above. Lots of them are probably from Sherex!

So how does it work? Installing the rivet nut is easy. Using a hand tool, pneumatic tool, or hydro-neumatic rivet nut tool, place the rivet through a pre-drilled hole. The tool will then crimp the counter-bored section of the rivet nut into the into the back of the installation piece as shown in the .gif below. This leaves the head of the rivet nut laying on top of the material, and the crimped section behind it acting as the nut. That’s really it! In a manufacturing plant, installation can be done through rivet nut automation systems.

Installing a Rivet Nut

Installing a rivet nut, then attaching to the base material with a bolt

Check out our rivet nut offerings and see the variety of different styles of rivet nuts which we will hit on in upcoming posts. Some applications need a wider grip range to accommodate larger panel thicknesses, some need stronger spin-out or pull-out loads to withstand a variety of expected loads, and some need different finishes, coatings, and other treatments. We will get into all of those topics later!