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What is an Intervis? 

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Les Intervis® are similar to a threaded insert or also a threaded threaded spacer. Its particularity is the slot it has. It is therefore a metal fixing device that can be used like a tap and allows you to screw directly into a smooth hole. A hole simply needs to be drilled beforehand. The insert itself cuts the thread into the material to ensure additional safety and strength.

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

At LGC Industries, there are several ranges ofIntervis®. First of all, they can be produced in various materials such as Crude Steel (SCTA), Zinc-plated Steel without chrome 6 (SCT), Brass or Stainless Steel.

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

Do not hesitate to Consult us If you are hesitant about choosing the Intervis and the material, our technical experts will guide you in the best way.

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The advantages that Intervis offer.

The use of an Intervis offers a multitude of advantages that allow greater time savings as well as a guarantee of efficiency. Due to the elimination of the pre-tapping stage, this part is 2x faster to install than a Helicoil. This part also offers wear due to tapping equal to 0%.

The advantage of Intervis®, in addition to their self-tapping during drilling, is their solidity. In fact, they have a high resistance during tearing (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 offers a maximum clearance between the spacer and the part of a maximum of 0.05 mm.

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What tools are needed to do an Intervis installation? 

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Les Intervis® are posed using a special tool called the “OT” type. This tool is mounted on a tapping machine or drill.

Description of the “OT” type tool.

1. Tail
2. Headless screw
3. Sleeve/rotating body
4. Nose nut
5. Threaded tip

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

So in summary, you need:

• Of your Intervis® 
• From a screwdriver or a tapping machine
• Of vis
• Assembly material
• Protective equipment (goggles, helmet)

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How to install Intervis® ? 

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

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

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NB: The diameters are approximate and may vary slightly depending on the material of your parts. A few tests will show you the optimum diameter. A hole that is too small will increase assembly efforts without increasing pull-out strength.

In addition, a chamfer will always make it easier to install the'Intervis®.

Schema legend:

• D 1: Ø of the chamber
• D 2: Ø drilling
• P: chambering = 1 step ≤ P ≤ 2 steps
• G: wall thickness
• D: outside of the Intervis®

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Regarding the minimum wall thickness, we advise you to take as a basis for G:

• 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.
• Chambering will be performed for hard and brittle plastics: D 1= D + 0.2 to 0.4 mm.

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You can now follow the steps to install your Intervis®:

1. Select the right size of self-tapping socket adapted to the material and its thickness
2. Mount the OT tool on the screwdriver
3. Introduce theIntervis® on the OT type 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 socket on the point you want to drill, making sure that the threaded portion is in line with the drilling point
6. Lower the spindle, the Intervis® is screwed into the hole and tapped into the material
7. Once stopped, the rotation stops. Reassemble the spindle (reverse rotation)
8. Your Intervis® is ready!

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Conclusion

Fasteners such as threaded inserts Intervis® must be chosen correctly in order to ensure optimal installation. We advise you to turn to fixing professionals to choose the products and the tools adapted to your applications.

At LGC Industries, we are experts by means of cylindrical fastening for 85 years. Our aim is to support our customers in co-design of the product adapted to their needs. That's why you can easily contact us on our website so that we can support you in your project and respect your specifications.

Thanks for reading and see you soon at LGC Industries!

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