Best Helical Threaded Inserts of 2025

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Helical threaded inserts are small, cylindrical metal components that are used to strengthen and repair threaded holes. They are commonly used in industries such as automotive, aerospace, and electronics, where the integrity of threaded connections is critical. These inserts provide a durable and reliable solution for reinforcing weakened or damaged threads, allowing for a stronger and longer-lasting connection. With their helical design, they are easy to install and provide excellent resistance to vibration and torque. Helical threaded inserts come in a variety of sizes and materials to suit different applications, making them a versatile choice for any threaded hole repair or reinforcement needs.
At a Glance: Our Top Picks
Top 10 Helical Threaded Inserts
E-Z Lok EK40820 Thread Repair Kit
The E-Z Lok Thread Repair Kit is designed to help you quickly fix damaged threads or strengthen tapped holes in soft metals. With durable 18-8 stainless steel inserts, this kit is resistant to corrosion and can handle high temperatures up to 800°F. It's perfect for use with materials like aluminum, cast iron, and magnesium, making it versatile for various applications. The kit comes complete with coil threaded inserts, a STI tap, and an installation tool, ensuring you have everything you need to make repairs efficiently.
E-Z Lok SK20510 Thread Insert Kit
The E-Z Lok Thread Insert Kit is an effective solution for repairing damaged threads in soft metals. With this kit, you can quickly restore functionality to stripped holes, ensuring your projects continue smoothly. The stainless steel inserts included are highly resistant to corrosion and can handle extreme temperatures up to 800°F, making them durable for various applications. Designed specifically for materials like aluminum and cast iron, this kit provides the versatility needed for different repairs. Additionally, it comes with all the necessary tools, including a drill and installation tools, for your convenience.
E-Z Lok SK20820 Thread Repair Kit
The E-Z Lok Thread Repair Kit offers a quick solution for fixing damaged threads or reinforcing tapped holes in softer metals. With stainless steel inserts, this kit resists corrosion and can handle high temperatures up to 800°F, ensuring durability and longevity. It's specifically designed for use with materials like aluminum and cast iron, making it versatile for various applications. The kit includes everything you need to get started: threaded inserts, a drill, an STI tap, an installation tool, and tang break tools, providing a comprehensive and convenient repair solution.
E-Z Lok Helical Threaded Insert Kit
The E-Z Lok Insert Kit is an essential tool for anyone needing to fix or strengthen damaged threads in soft metals. With this kit, you can quickly restore functionality to stripped or worn threads, making repairs hassle-free. The stainless steel inserts are not only resistant to corrosion but can also handle high temperatures, providing durability in various conditions. Designed specifically for soft metals like aluminum and magnesium, this kit ensures a secure fit. It comes complete with everything you need, including drill bits and installation tools, making it a convenient all-in-one solution for your repair needs.
E-Z Lok EK30610 Thread Repair Kit
The E-Z Lok Thread Repair Kit is designed to help you quickly fix damaged threads or strengthen tapped holes in soft metals. With 18-8 stainless steel inserts, this kit ensures durability and resistance to corrosion, making it suitable for high-temperature applications up to 800°F. The inserts work well with soft metals like aluminum and magnesium, so you can tackle a variety of repair jobs. Additionally, the kit comes complete with coil inserts, an STI tap, and an installation tool, giving you everything you need for a smooth repair process.
E-Z Lok SK40410 Thread Insert Kit
The E-Z Lok Thread Insert Kit is your go-to solution for quickly fixing damaged threads or bolstering weak holes in soft metals. With its stainless steel inserts, you can enjoy enhanced durability as they resist corrosion and can handle high temperatures up to 800°F. This kit is perfect for use with materials like aluminum and cast iron, making it versatile for various applications. It comes complete with everything you need, including threaded inserts, a drill, a tap, and an installation tool, simplifying the repair process for you.
Hilitand 80Pcs M8x1.25 Threaded Inserts
The Hilitand Threaded Inserts provide excellent performance in low-strength materials like aluminum, ensuring strong connections while preventing thread damage. They are especially useful for parts that require frequent disassembly, significantly extending the lifespan of the threads. With a degree of elasticity, these inserts distribute loads evenly, reducing wear and absorbing vibrations to enhance connection strength. Additionally, they help prevent screw loosening, making them ideal for applications that demand high safety standards. Overall, these inserts offer a practical solution for maintaining the integrity of threaded connections.
E-Z Lok SK40620 Helical Insert Kit
The E-Z Lok Helical Insert Kit is designed to help you efficiently repair damaged threads or strengthen tapped holes in soft metals. With stainless steel inserts, this kit is resistant to corrosion and can handle high temperatures up to 800°F, making it suitable for various applications. It's perfect for use with metals like aluminum, magnesium, and cast iron. The kit conveniently includes everything you need: threaded inserts, a drill, an STI tap, an installation tool, and tang break tools, ensuring you have all the necessary tools at your fingertips for a smooth repair process.
E-Z Lok SK21010 Helical Threaded Insert Kit
The E-Z Lok Threaded Insert Kit is a convenient solution for quickly repairing damaged threads or reinforcing tapped holes in soft metals. It includes stainless steel threaded inserts that are resistant to corrosion and can withstand high temperatures. This kit is specifically designed for use with soft metals such as aluminum, cast iron, and magnesium. With the included drill, STI tap, threaded insert installation tool, and tang break tools, you have everything you need to easily complete the repair or reinforcement. Whether you need to repair threads or reinforce tapped holes, this kit provides a reliable and durable solution that can withstand even high temperatures.
E-Z Lok SK20610 Thread Repair Kit
The E-Z Lok Thread Repair Kit is your go-to solution for quickly fixing damaged threads or reinforcing tapped holes in soft metals. This kit features stainless steel inserts that resist corrosion and can handle high temperatures up to 800°F, making it ideal for various applications. Whether you’re working with aluminum, cast iron, or magnesium, this kit ensures durability and reliability. With everything you need included—coiled inserts, a drill, STI tap, installation tool, and tang break tools—you can easily complete your repairs and get back to your projects with confidence.
Frequently Asked Questions (FAQs)
1. What is the difference between helical insert and threaded insert?
The main difference between a helical insert and a threaded insert is in their construction. Helical inserts, such as Heli-Coil inserts, are made of wound wire and have less pull-out and torque-out strength compared to solid metal threaded inserts like Helisolid®. Helical inserts may be more prone to cross-threading, while accidental cross-threading is nearly impossible with Helisolid® threaded inserts.
2. What are helical inserts used for?
Helical inserts, also known as screw thread inserts (STI) or helicoil inserts, are coiled wire inserts used to repair stripped threading and reinforce bolted connections. These inserts are wider than the tapped hole and provide increased strength and durability to the threaded assembly.
3. What is the difference between an insert and a Heli-Coil?
The main difference between an insert and a Heli-Coil is their size and installation process. Inserts are larger and require a large external thread for installation, while Heli-Coil inserts have a slim profile. Additionally, the removal process for inserts involves drilling out material, bending the key insert, and using a screw extractor, while Heli-Coil inserts have a simpler removal process.
4. Should I use Loctite in a Heli-Coil?
Yes, it is recommended to use Loctite in a Heli-Coil installation. Specifically, LOCTITE® 262™ is a high-strength threadlocker that can be used with Heli-Coil inserts. It provides added security and helps prevent loosening or thread failure.
5. What is the strongest thread insert?
The helically coiled wire thread insert is considered the strongest and most durable threaded assembly available. It provides excellent strength and durability for various applications, making it a preferred choice for engineers.
6. What are the disadvantages of threaded inserts?
There are a few downsides to using threaded inserts. First, they tend to have a higher cost compared to standard drilling and tapping methods. The price of threaded inserts, combined with additional installation charges, can add up quickly. Additionally, threaded inserts may not be suitable for all applications and may require specialized tools or expertise for installation.
7. What is the advantage of using a Heli-Coil?
Using a Heli-Coil, such as HELICOIL® thread inserts, offers several advantages. They are particularly beneficial when working with low shear strength materials like aluminum or aluminum-magnesium alloys. Heli-Coil inserts provide heat-resistant, wear-resistant, and high-strength threads of the highest precision. They also minimize internal thread wear, even with frequent use.
8. How deep should a HeliCoil go?
For proper installation, a HeliCoil insert should be inserted to a depth of 1/4 to 1/2 turn below the top of the original hole. This ensures secure and effective thread reinforcement. It's recommended to consult with experts or refer to specific guidelines for accurate installation depth.
During our helical threaded insert research, we found 24 helical threaded insert products and shortlisted 10 quality products. We collected and analyzed 5,037 customer reviews through our big data system to write the helical threaded inserts list. We found that most customers choose helical threaded inserts with an average price of $22.77.
The helical threaded inserts are available for purchase. We have researched hundreds of brands and picked the top brands of helical threaded inserts, including E-Z LOK, Hilitand. The seller of top 1 product has received honest feedback from 385 consumers with an average rating of 4.7.

Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.