How to install Intervis® threaded inserts

‍What is an Intervis insert? 

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Intervis® inserts are similar to threaded inserts or spacers with an interal and external thread. Its unique slot is what makes it special - it is a metal fixing device that can be used as a screw tap and can be screwed directly into a smooth hole. All you need to do is drill this hole beforehand. The insert itself carves the thread into the material to ensure additional security and strength.

Thanks to Intervis®, you can fix fasteners such as screws into medium-hard materials such as plastics, compressed wood or light alloys ideally.

At LGC Industries, we offer several different ranges of Intervis® inserts. They can be manufactured in various materials such as crude steel, zinc-plated steel (chromium 6-free), brass or stainless steel.

• The 3-hole threaded Intervis® has 3 equidistant cylindrical holes on its outer surface
• The Intervis® threaded slotted insert has two longitudinal slits on the sides.

Please feel free to contact us should you have any queries about what Intervis and material to choose. Our technical experts will be happy to advise you.

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Advantages of Intervis inserts

Intervis inserts offer numerous advantages to the user, saving time and guaranteeing efficiency. Since the pre-tapping stage is eliminated from the equation, this part is 2x faster to install than a Helicoil. 0% wear when threading.

The big advantage of Intervis®, besides their self-tapping capabilities when drilling, is their solidity. In fact, they have high pull-out resistance (on average 30% greater resistance than equivalent fasteners). As a result, wear during regular screwing and unscrewing is slower and the part lasts longer.

The use of this part also means a maximum clearance of 0.05mm between the spacer and the part.

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What tools are required to install an Intervis insert?

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Intervis® are fitted using a special OT-type tool. This tool is mounted on a tapping machine or drill.

Description of the OT-type tool:

1. Shank
2. Headless screw
3. Dowel/rotating body
4. Nose nut
5. Threaded tip

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You can choose the size of your tool according to the Intervis® inserts you have. Please refer to the table below:

In short, you will need:

• Your Intervis® insert(s)
• A screw gun or a tapping machine
• Screws
• Assembly material
• Protective equipment (goggles, helmet)

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How do you fit Intervis® inserts? 

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Now that you have all the materials you need, you can get on with the installation.

Please refer to the following table and diagram when installing Intervis® inserts.

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NB: The diameters given here are approximate and may vary slightly depending on your parts' material. With a few tests you will be able to get the optimum diameter. A hole that is too small will require increased assembly force, without increasing the pull-out strength.

A chamfer can also make it easier to install an Intervis® insert.

Legend:

• D 1: Ø of the counterbore
• D 2: Ø drill hole
• P: counterbore = 1 pitch ≤ P ≤ 2 pitch
• G: wall thickness
• D: outside of the Intervis® insert

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For G, we advise you to follow the following minimum wall thicknesses:

• 0.25 D to 0.9 D for plastics.
• 0.25 D to 0.6 D for light alloys.
• 0.30 to 0.5 D for cast iron.
• A counterbore will be made in the case of hard and brittle plastics: D 1= D + 0.2 to 0.4 mm.

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Follow the steps below to install your Intervis® insert:

1. Select the right size for the self-tapping dowel pin, depending on the material in question and its thickness
2. Place the OT-type tool onto the screw gun
3. Put the Intervis® insert onto the OT tool. The slot should be facing the material to be drilled
4. Tighten the first nut against the socket then tighten the lock nut
5. Place the dowel at the point where you want to drill, making sure that the threaded section is aligned with the drilling point
6. Lower the spindle. The Intervis® insert now screws into the hole and taps itself into the material
7. Once fully inside, it stops rotating. You can now bring the spindle back up (reverse rotation)
8. Your Intervis® insert is now installed!

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Summary

As for any fasteners, it's important to choose the right Intervis® threaded insert to ensure an optimal install. We would advise you to get in touch with fastening professionals in order to choose the products and tools best suited to your application.

Here at LGC Industries, we have over 85 years of expertise in cylindrical fasteners. We aim to support our customers in co-designing products tailored to their needs. That's why you can easily contact us on our website: write us a message and we will be able to support and accompany you with your project, including any specifications you may have.

Thank you for reading - hope to see you soon at LGC Industries!

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