What is a threaded insert?

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Threaded inserts, also known as threaded bush or under the LGC registered trademark "Intervis ®", are cylindrical fasteners used to self-create strong, durable threads in a wide variety of materials such as plastics, composites and soft and medium-hard metals.

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Thanks to their ingenious design, intervis inserts offer a reliable and effective solution for reinforcing fasteners in industrial and commercial applications.

Whether you're assembling plastic parts in the automotive industry or securing components in composite aircraft, Intervis® threaded inserts guarantee optimum pull-out resistance.

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What is a 3-hole threaded insert?

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TheIntervis 3-hole threaded insert belongs to the family of self-tapping sockets. It differs from a conventional Intervis insert in that it is simply a type of threaded insert with a smaller height. 

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The latter has 3 holes to easily evacuate the material chips created when tapping the material during installation.

This metal bushing features standardized tapping and an external thread suitable for applications with smaller heights and thicknesses.

The intervis3-hole threaded insert is generally used to fasten components in flexible materials such as : 

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• The wood
• Plastic
• Composites

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3-hole threaded inserts can be found in a variety of demanding industrial applications such as :

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• In the automotive industry
• In electronic board mounting.
• And also the attachment of components to bicycles, skis and snowboards.

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How is an LGC 3-hole threaded insert made?

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The first step is to gather information on the customer's needs. Understanding these needs is the first key to success in designing the ideal threaded insert for your application.

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The second stage is the prototyping phase. 

In fact, LGC is able to supply prototypes in order to distinguish between several inserts designed by the design office, or to test the final product in order to identify any discrepancies with the customer's requirements. 

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Once the solution has been validated, we move on to the industrialization stage, where our methods department determines the tools required to manufacture your 3-hole insert, according to the grade and dimensions required.

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Here's how your 3-hole intervis insert is made:

The start of the manufacturing process for Intervis® 3-hole threaded inserts is similar to that of our classic our classic intervis self-tapping sockets.

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First step: external threading of the raw material coil

This stage is called rolling, as the inter-screw passes between 3 rollers. The rolling system cold-forms the part by compressing it to create the thread. 

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Second stage: cutting the raw material tube

The tube is cut to the desired length.

The material can be chamfered or finished to suit its future application.

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Third step: drilling

A cnc machining centre drills the part and creates the 3 holes characteristic of the 3-hole intervis.

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Last step: tapping

This is the internal thread of the threaded bush.

To achieve this, a cnc machine fitted with a rotating tap will pass inside the part to give it its thread.

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Would you like to find out more about how our threaded inserts are made?

Discover our technical guide to Intervis® threaded inserts

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What are the advantages of a 3-hole intervis threaded insert?

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Each type of insert offers distinct functionalities, accompanied by advantages both in terms of use and in their respective technical specifications.

The3-hole threaded insert is a part that offers several notable advantages over other types of self-tapping threaded inserts. The 3-hole threaded insert guarantees :

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• Increased strength: The innovative design of the 3-hole threaded insert, with its three holes, gives it exceptional strength against tensile and shear forces. This enhanced strength ensures a robust, long-lasting fastening, perfectly suited to applications requiring maximum safety.
• Long-lasting durability: The 3-hole design ensures longer life in soft materials, as the holes allow the bushing to distribute itself in the material, reducing stress and the risk of breakage.