How to Use a Helicoil

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how to use a helicoil


Behold the world of helicoils! In this article, we will explore the fascinating concept of helicoils and their purpose in various applications. Imagine a tiny coil that can work wonders in repairing damaged threads or creating strong, reliable connections. Well, that’s exactly what a helicoil does! It is a small, wire-like insert that is used to reinforce or repair threads in materials such as metal, plastic, or wood.

The primary purpose of a helicoil is to provide a stronger and more durable thread in situations where the original thread has become weak or stripped. It acts as a reliable anchor that prevents the fastener from loosening or coming out under stress or vibration. Whether it’s a car engine, an airplane component, or even a simple household item, a helicoil can be the secret ingredient to ensure a secure and long-lasting connection.

But why do we need helicoils in the first place? Well, threads can become damaged due to wear and tear, over-tightening, or improper installation. In some cases, the original threads may not provide enough strength for the required load or may be prone to stripping. That’s where helicoils come to the rescue, providing a quick and effective solution to restore or enhance the threading system.

So, get ready to dive into the world of helicoils and discover how these ingenious little inserts can revolutionize the way we approach thread repairs and connections. In the following sections, we will explore what helicoils are, when to use them, the tools and materials required, step-by-step installation guide, tips and best practices, common mistakes to avoid, troubleshooting tips, alternative methods, safety precautions, and finally, wrap up with a summary of the key points discussed. Let’s get started on this exciting journey!

What is a Helicoil?

A helicoil is a small, coiled wire insert that is used to repair or reinforce damaged or stripped threads. It is essentially a miniature spring that is made of high-quality stainless steel or other strong materials. The helicoil is designed to be inserted into a pre-drilled hole, acting as a replacement for the original threads.

The primary purpose of a helicoil is to provide a stronger and more durable threading system. When a screw or bolt is tightened into a helicoil, the insert expands and grips the threads, creating a secure and reliable connection. This prevents the threads from becoming worn or stripped, even when subjected to high levels of vibration or tension.

Helicoils are used in a wide range of applications across various industries. They are commonly employed in automotive, aerospace, and manufacturing industries, where the integrity of threaded connections is crucial. Helicoils can be used in both metal and non-metallic materials, making them versatile and adaptable to different environments.

In addition to their strength and durability, helicoils offer other benefits as well. They can improve the overall performance of threaded connections by providing a more precise fit and reducing the likelihood of loosening over time. Furthermore, helicoils can save time and money by eliminating the need for expensive repairs or replacements of entire components.

Helicoils are a simple yet highly effective solution for repairing damaged threads and enhancing the reliability of threaded connections. Their versatility, strength, and cost-effectiveness make them an essential tool for professionals and DIY enthusiasts alike.

When to Use a Helicoil

Knowing when to use a helicoil is essential for ensuring the longevity and reliability of threaded connections. One common situation where a helicoil is necessary is when the threads in a hole have become stripped or damaged. This can happen due to over-tightening, corrosion, or wear and tear over time. Instead of replacing the entire component, a helicoil can be inserted to restore the threads and provide a stronger connection.

Another scenario where a helicoil is beneficial is when working with soft materials such as aluminum or plastic. These materials are more prone to thread damage and stripping, and using a helicoil can prevent this issue. By installing a helicoil, the load is distributed over a larger area, reducing stress on the threads and increasing the durability of the connection.

Helicoils are often used in high-stress applications where vibration or frequent disassembly and reassembly are common. The coils in a helicoil act as springs, providing tension and preventing the threads from loosening under these conditions. This ensures that the connection remains secure and stable, even in demanding environments.

In summary, a helicoil should be used when the threads in a hole are damaged, when working with soft materials, and in high-stress applications. By using a helicoil in these situations, you can ensure the strength, durability, and reliability of your threaded connections.

Tools and Materials Needed

To effectively use a helicoil, you will need a few essential tools and materials. First and foremost, you will need a helicoil kit, which typically includes the helicoil inserts, a tap, and an installation tool. The helicoil inserts are the key component of the kit, as they provide the new threads for the damaged hole.

In addition to the helicoil kit, you will also need a drill and the appropriate drill bit size for the helicoil insert. It is crucial to use the correct drill bit size to ensure the proper fit and alignment of the helicoil insert.

To prepare the hole for the helicoil insert, you will need a tap. The tap is used to create the threads in the hole, allowing the helicoil insert to be screwed in securely.

To install the helicoil insert into the hole, you will need an installation tool. This tool is designed to thread the helicoil insert into the hole, ensuring it is positioned correctly and tightly.

You will need a lubricant, such as cutting oil or tap lubricant, to make the drilling and tapping process smoother. The lubricant reduces friction and heat, preventing damage to the drill bit and tap while also improving the overall effectiveness of the helicoil installation.

By having these tools and materials on hand, you will be well-equipped to use a helicoil effectively and efficiently. Remember to follow the manufacturer’s instructions and take necessary safety precautions throughout the process.

Step-by-Step Guide

Now that you have all the necessary tools and materials, you are ready to begin the step-by-step process of using a helicoil. Follow these instructions carefully to ensure a successful installation.

1. Start by preparing the damaged hole. Clean the hole thoroughly to remove any dirt, debris, or old threads. You can use a brush or compressed air to clean the hole effectively.

2. Next, drill out the damaged threads using the appropriate size drill bit. Make sure the hole is straight and centered. The size of the drill bit should match the outside diameter of the helicoil insert.

3. After drilling, tap the hole using the provided tap. The tap will create new threads inside the hole. Apply cutting oil or tap lubricant to the tap to reduce friction and ensure smooth threading.

4. Now, insert the helicoil into the hole. Use the installation tool to thread the helicoil into the newly tapped hole. Make sure the helicoil is inserted fully and sits flush with the surface.

5. Once the helicoil is in place, use a tang break tool to remove the tang. The tang is a small tab located at the bottom of the helicoil that keeps it secure during installation. Break off the tang by applying a gentle twisting motion.

6. Finally, inspect the helicoil to ensure it is properly installed. Check for any signs of misalignment or protrusion. The helicoil should be firmly seated in the hole with no gaps or movement.

Congratulations! You have successfully used a helicoil to repair a damaged thread. Remember to test the strength and functionality of the repaired area before putting it back into service. With practice, using a helicoil will become easier, and you will be able to tackle more complex thread repair jobs with confidence.

So, go ahead and give it a try. You’ll be amazed at the strength and durability a helicoil can provide!

Tips and Best Practices

When using a helicoil, there are several tips and best practices that can help ensure a successful installation and repair. First and foremost, it is important to thoroughly clean the hole and surrounding area before inserting the helicoil. Any debris or contaminants can hinder the proper seating of the helicoil and affect its performance.

Applying a lubricant to the helicoil and the installation tool can make the process smoother and reduce friction. This can help prevent the helicoil from binding or getting stuck during installation. It is also recommended to use a thread locking compound on the helicoil to provide additional security and prevent loosening over time.

Another tip is to use the correct size helicoil for the application. Using a helicoil that is too small or too large can result in a weak or ineffective repair. It is important to carefully measure the hole and choose the appropriate helicoil size accordingly.

When inserting the helicoil, it is crucial to apply steady and even pressure to ensure proper alignment and seating. Using a helicoil installation tool or a tap handle can help provide the necessary control and leverage.

It is recommended to follow the manufacturer’s instructions and guidelines when using a helicoil. Each helicoil brand may have specific recommendations for installation techniques and torque specifications. Adhering to these instructions can help optimize the performance and longevity of the helicoil repair.

By following these tips and best practices, you can ensure a successful helicoil installation and achieve a strong and reliable thread repair. Keep these guidelines in mind and you’ll be well on your way to mastering the art of helicoil usage!

Common Mistakes to Avoid

While using a helicoil, beginners often make some common mistakes that can compromise the effectiveness of the thread repair. One of the most frequent errors is not properly preparing the hole before inserting the helicoil. It is essential to clean the hole thoroughly and remove any dirt, debris, or existing thread material that may hinder the insertion of the helicoil.

Another mistake is using excessive force when inserting the helicoil. Beginners may apply too much pressure, causing the helicoil to get stuck or become misaligned. It is important to use a controlled and gentle force to guide the helicoil into the hole. This ensures proper alignment and prevents any damage to the helicoil or the surrounding material.

Beginners sometimes fail to use the appropriate size of helicoil for the threaded hole. Using a helicoil that is too large or too small can lead to ineffective thread repair. It is crucial to carefully select the correct size of helicoil that matches the diameter and pitch of the original thread.

Beginners often neglect to apply the recommended threadlocker or adhesive to secure the helicoil in place. This can result in the helicoil becoming loose over time and compromising the integrity of the repair. It is important to follow the manufacturer’s instructions and use the recommended threadlocker or adhesive to ensure a secure and long-lasting repair.

Beginners may overlook the importance of using the proper installation tools. Using improper tools or techniques can make the installation process challenging and increase the risk of errors. It is crucial to use the recommended installation tools, such as a helicoil installation tool or a tap handle, to ensure proper alignment, seating, and control.

To avoid these common mistakes, beginners should take their time and carefully follow the instructions provided by the helicoil manufacturer. Thoroughly prepare the hole, use the correct size of helicoil, apply the recommended threadlocker or adhesive, and use the appropriate installation tools. By avoiding these mistakes, beginners can achieve a successful helicoil installation and create a reliable and durable thread repair.


While helicoil installation is generally a straightforward process, there can be some common issues that arise. One common issue is the helicoil not threading smoothly into the hole. This can be caused by debris or dirt in the hole, which can affect the threading process. To solve this issue, it is important to ensure that the hole is clean before inserting the helicoil. Using a cleaning tool or blowing compressed air into the hole can help remove any debris or dirt.

Another common issue is the helicoil not sitting flush with the surface. This can happen if the helicoil is not installed at the correct depth or if there is excess material on the surface. To address this issue, make sure to measure the depth of the hole and install the helicoil accordingly. Additionally, remove any excess material on the surface to ensure a flush installation.

If the helicoil is stripped or damaged during installation, it will not provide a reliable thread repair. This can happen if too much force is applied during the installation process. To prevent this, it is important to use the recommended installation tools and follow the manufacturer’s instructions. If a helicoil is damaged, it should be replaced with a new one.

If the helicoil does not hold the threaded component securely, it may be due to improper installation or an incorrect size of helicoil. Double-check the installation process to make sure it was done correctly. If the helicoil is the wrong size, remove it and replace it with the correct one.

By addressing these common troubleshooting issues, beginners can overcome challenges and achieve a successful helicoil installation. It is important to closely follow the installation instructions and take the necessary precautions to ensure a reliable and durable thread repair.

Alternative Methods

While helicoils are widely recognized as a reliable and effective thread repair solution, there are alternative methods and products available for situations where a helicoil may not be the best option. One such alternative is the use of thread inserts.

Thread inserts, also known as thread repair inserts or screw thread inserts, are cylindrical metal inserts that are designed to be threaded into a damaged or worn-out hole. These inserts create new threads, allowing for the secure installation of bolts or screws. Thread inserts are available in various materials, such as stainless steel and brass, and come in different sizes to accommodate different hole diameters.

Another alternative method is the use of thread repair kits. These kits typically include a selection of wire thread inserts, along with the necessary installation tools. The wire thread inserts are similar to thread inserts but are made of coiled wire. They are inserted into the damaged hole and provide a strong and durable new thread.

In some cases, welding may be used as an alternative method for repairing damaged threads. This method involves adding material to the damaged area using welding techniques and then re-tapping the hole to create new threads. However, welding is a more complex and time-consuming process compared to using helicoils or thread inserts.

It’s worth remembering that the choice of alternative method or product depends on factors such as the nature and severity of the damage, the material of the threaded component, and the desired level of durability. Consulting with a professional or expert in thread repair can help determine the most suitable alternative method for a specific situation.

While helicoils are a popular and widely used thread repair solution, it is good to know that there are alternative methods and products available for different scenarios.

Safety Precautions

When using a helicoil, it is essential to take certain safety precautions to ensure a smooth and secure installation process. Firstly, always wear appropriate personal protective equipment (PPE) such as safety goggles, gloves, and a dust mask. This will protect you from any potential flying debris, sharp edges, or inhalation of dust particles.

Secondly, make sure to work in a well-ventilated area to minimize the risk of inhaling harmful fumes or gases. If you are working indoors, open windows or use exhaust fans to ensure proper air circulation. If working outdoors, consider wearing a respirator to filter out any airborne contaminants.

Another important safety precaution is to securely clamp or fasten the component being repaired. This will prevent any movement or slippage during the helicoil installation process, ensuring accurate and precise thread repair. Use a sturdy vise or clamping device that can securely hold the component in place.

Be cautious when handling the helicoil inserts and the installation tools. These tools are sharp and can cause injury if mishandled. Always follow the manufacturer’s instructions and use the appropriate tools for the job. Avoid touching the sharp edges of the helicoil inserts and wear protective gloves when handling them.

Keep your work area clean and organized. Remove any unnecessary tools or debris from your workspace to prevent accidents or damage to the component. Ensure that there are no loose objects that could interfere with the helicoil installation process.

By following these safety precautions, you can minimize the risk of accidents or injuries while using a helicoil and ensure a successful thread repair.


Helicoils are a versatile and effective solution for repairing damaged threads. They provide a reliable method for restoring the integrity of a threaded hole and ensuring that fasteners can be securely tightened. Throughout this article, we have discussed the concept of a helicoil and its purpose, as well as the situations where using a helicoil is necessary or beneficial.

We have also explored the tools and materials needed for a helicoil installation and provided a detailed step-by-step guide for using a helicoil effectively. Additionally, we have shared some tips and best practices, highlighted common mistakes to avoid, and addressed troubleshooting techniques.

While helicoils are a popular choice for thread repair, it’s important to note that there are alternative methods and products available as well. Depending on the specific application and requirements, other options may be more suitable. However, helicoils offer a reliable and cost-effective solution for many threaded hole repair situations.

To ensure a successful helicoil installation, it is crucial to follow the recommended safety precautions. This includes wearing protective gloves, using the appropriate tools, and keeping the work area clean and organized. By prioritizing safety, you can minimize the risk of accidents or injuries while using a helicoil.

In closing, helicoils are an invaluable tool for anyone working with threaded components. Whether you’re repairing damaged threads or reinforcing weak ones, helicoils provide a durable and long-lasting solution. By understanding how helicoils work and following the recommended guidelines, you can confidently tackle thread repair projects with ease.