Threaded bushing design and manufacturing

Bushings with internal thread (tap): assembly and fastening all in one part

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Bushings or dowels with internal threads are essential elements in ensuring solid and consistent fastening of your parts. Thanks to their cylindrical design, with an internal thread, they offer excellent pull-out resistance.

You can screw and unscrew them at will, which makes it much easier to put together and dismantle your assemblies.

At LGC, we understand the importance of designing tailor-made solutions to meet your specific requirements. This is why we support and advise you throughout the process, offering prototyping, measurement and pull-out resistance testing. In addition, our know-how in the field means we can help you industrialize your project by offering you effective installation and assembly solutions.

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How are LGC threaded bushings made?

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From material to a threaded bushing

The beginning of the manufacturing process for threaded dowel pins is similar to that of threaded inserts and self-tapping dowel pins.

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The first step is to prepare the raw material coil.

Then, the part undergoes cold deformation, which improves the material's elastic strength.

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The second step involves cutting the tube of raw material with a suitable machine.

The tube is cut to the desired length. Chamfers or finishes can be added to the material.

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It then goes through a grinding stage. A die presses the parts against a grinding wheel rotating at high speed. Thanks to abrasion from the grinding wheel, the diameter of the part is modified to reach tolerances of just a few microns (~5-6 μm).

Then it's time for tapping - a rotating tap will pass through the inside of the part to give it the right internal thread.

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What advantages does a threaded dowel pin offer?

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• Reinforcement when used in soft materials: Threaded dowel pins or bushings reinforce fastening elements in soft materials, giving increased strength to fasteners with screws and bolts. This is particularly useful in assemblies that are under significant loads.
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• Increased lifespan: Thanks to their ability to provide a stronger (external) thread, threaded dowel pins extend the lifespan of your assemblies by minimising wear and tear of the thread over time.
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• Reduced risk of tearing: These spacers reduce the risk of taps being ripped out, ensuring stable fastening even under conditions with variable loads.
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• Ease of repair: In the event of damaged tapping, a tapped dowel (pin) is an efficient repair option, eliminating the need to replace expensive components.
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• Application in demanding environments: Threaded dowel pins are well able to withstand highly demanding environments, and are a dependable solution even in conditions where other types of fasteners are not.