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  4. Installation of HELICOIL® thread inserts

Thread-forming in metal


There are plenty of options, from simple manual installation tools to standard tools to fully automated complete systems.

Installation mandrel for HELICOIL® Smart – The thread insert with tang that does not have to be broken off.

Thread-forming in metal

Creating high-strength fastenings

Our assembly solutions are designed as fully automatic or semi-automatic workstations. Depending on your requirements, parts can be handled by the operator, a handling system, a rotary indexing system or a transfer system. Take a look at our assembly solutions.

Method and principle

The HELICOIL® installation process

HELICOIL® thread inserts create high-strength, wear-resistant, heat-resistant thread of the highest precision by transferring the forces from flank to flank into the pilot thread. The reduced diameter of the HELICOIL® Plus in the first turn ensures that the thread insert can be installed like a screw.

Installing HELICOIL® thread inserts is easy and cost-effective, because there are only a few basic rules to follow. For efficient assembly, whether for a single application or for high-volume production, we provide a broad range of manual and automated installation tools.

The HELICOIL® system combines conformance to standards with easy installation.

The installation steps in detail

Core hole drilling

You can use a standard twist drill. 
Use a 90° cutter for countersinking and deburring before thread cutting. External diameter of the countersink = DHC + 0.1 mm.

HELICOIL® core hole drilling

Thread cutting

You should use our system’s original HELICOIL® taps to cut the HELICOIL® Plus pilot thread. Use HELICOIL® plug gauges to verify that pilot thread is true-to-gauge.

HELICOIL® thread-cutting

Thread forming

Use a thread former to quickly and easily produce a chipless internal thread.

HELICOIL® thread forming

Thread installation

You can carry out the installation with a manual installation tool, an automatic installation tool or a fully automated solution.

HELICOIL® Plus Free Running – thread insert for metals


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Find the right solution for your application


System-specific original HELICOIL® taps should be used for cutting the HELICOIL® Plus pilot thread. We supply a range of suitable manual and automatic taps.

HELICOIL® installation mandrels

Installation mandrels in various shapes for installation of HELICOIL® Plus, HELICOIL® Tangfree – Free Running and Screwlock, and HELICOIL® Smart Free Running.

HELICOIL® tools with installation mandrel

For processing HELICOIL® Plus, HELICOIL® Tangfree and HELICOIL® Smart thread inserts. Essentially there are three different types of installation tools. The choice depends on the number of HELICOIL® thread inserts to be processed, the location of the tapped holes in the workpiece, and the thread size.

HELICOIL® tools with prewinder

For processing HELICOIL® Classic, HELICOIL® Plus and HELICOIL® Tangfree thread inserts. Pitch-controlled manual installation tools for processing loose and magazined HELICOIL® thread inserts.

HELICOIL® manual tools

For HELICOIL® Classic and HELICOIL® Plus thread inserts The manual tools are available with and without pitch control.

HELICOIL® tang break-off tools

For quick and easy tang break-off on HELICOIL® Classic and HELICOIL® Plus thread inserts.

HELICOIL® extraction tool

For the manual and mechanical extraction of HELICOIL® thread inserts

HELICOIL® Accessories


HELICOIL® Automatic installation tools

Cost-effective installation of HELICOIL® thread inserts is just as important as their high quality standard. Our range includes modules for integration into automatic processes and complete systems.

Do you have specific requirements? If so, please contact us!

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Boellhoff Helicoil


The HELICOIL® technology

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