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Threaded inserts - Self-tapping threaded sockets - Intervis
Threaded inserts, self-tapping sockets: the advantages of Intervis
What is a threaded bushing?
Threaded bushes are indispensable for repairs and threading in materials that cannot be tapped.
In soft and medium-hard materials such as light alloys, plastics and compressed wood, threaded holes often fail to withstand repeated stresses. If a screw is tightened too vigorously or too frequently, the threads may pull off, rendering the part unusable.
This is where self-tapping sockets, also known as threaded inserts, come in!
A threaded bush creates an extremely solid anchorage with the material in which it is installed, as it creates its own thread during assembly. Unlike other threaded inserts, this type of insert does not require pre-drilling. A self-tapping bush thus offers greater resistance to tearing when loosened.
A threaded bushing has a standardized thread and an appropriate external thread.
- External thread truncation.
- Two slots with sharp edges.
Using this set, you can screw the threaded bushing directly into a pre-drilled smooth hole, just as you would with a tap.
The advantages of an Intervis® threaded insert
At LGC Industries, we have developed the Intervis brand - an innovative threaded insert, also known as a threaded sleeve.
Intervis threaded sockets offer a practical tapping and screwing solution, allowing you to insert them directly into a pre-drilled hole. Thanks to their ability to cut their own thread into the material, these inserts guarantee extra safety and strength.
We recommend that you use Intervis threaded inserts in aluminum assemblies, as their surface treatment eliminates the electrolytic torque between the two materials. Drilling groups are an average indication. During installation, it is advisable to carry out a trial run by drilling 1/10th above or below the indicated diameter, to take account of the particular characteristics of certain materials.
Intervis® threaded bushes have several advantages:
- Inserts into material without pre-tapping
- Eliminate play between spacer and workpiece
- Excellent pull-out resistance
- Between 30% and 40% overlap, Intervis® reaches its maximum pull-out resistance
- Eliminates thread wear
- Absolute safety in use
At LGC Industries, there are several ranges of Intervis® threaded inserts available in different materials such as Crude Steel (SCTA), Chromium 6-free Zinc-plated Casehardened Steel (SCT), Brass or Stainless Steel.
The different types of Intervis® insert
The standard Intervis® threaded insert is inserted directly into a pre-drilled hole. It works like a tap, creating the thread in the hole itself. This type of fastener is ideal for medium-hard materials such as light alloys, compressed wood and plastics. Installation is simple and efficient.
For low-height Intervis® STHC threaded inserts, we have added 3 holes on the self-tapping sleeve to facilitate the evacuation of material chips when tapping the assembly material.
In short, the 3-hole Intervis® SCTH threaded insert is a practical alternative to standard 1-slot Intervis® inserts for smaller heights and thicknesses.
Would you like to find out more about our Intervis® threaded bushes?
Visit our dedicated article: All you need to know about Intervis® threaded inserts
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Intervis®, a registered trademark for threaded inserts, are cylindrical fasteners used in building construction and, more generally, in the assembly of materials. They can be tricky to get to grips with, but this guide will help you to install them safely and easily.