E-Z LOK™ Threaded Inserts for Metal
E-Z Hex™, E-Z Knife™ Threaded Inserts for Wood
E-Z Press™, E-Z Fin ™, E-Z Sonic™ Threaded Inserts for Plastic
E-Z LOK™ Kits

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A Closer Look at Coil Inserts

A coil insert is an ideal solution for repairing or reinforcing tapped holes in metal. But you need to know how to install a coil insert properly to get maximum performance. To get the best possible use out of a coil insert, you need to properly drill and tap the hole. Coil inserts compress during installation, and it’s that compression that secures the insert into place and keeps it from backing out. A properly drilled and tapped hole allows the insert to form properly, develop the desired thread tolerance, and provide optimum performance.

1. How do metal threaded inserts work?

Prior to installation, coil inserts are larger in diameter then the hole into which they will be installed. During installation, the coil insert compresses and is stretched out by the threads cut by the STI tap. After the insert is installed, the compressed insert pushes out against the wall of the hole. It is this outward pressure that keeps the coil insert in place.

2. What are the benefits of using helical coil inserts?

E-Z LOK's helical coil insert selection can help you quickly repair or reinforce tapped holes in soft metals. Other benefits include:

  • Corrosion resistance
  • Ability to withstand temperatures of up to 800°F.
  • Protection from stripping and wearing.

I still have questions on how to install a coil insert. Can E-Z LOK assist?

We'd be happy to assist you with questions about installing coil inserts or any other of our products. Fill out our contact form or reach out to our customer service representatives at the following number: 800-234-5613. We also recommend checking out our additional resources below for more information about coil inserts.

E-Z LOK Threaded Inserts


Creating innovating threaded inserts, E-Z LOK is a third-generation, family-owned and operated business founded in 1956. The E-Z LOK threaded insert design allows users to repair damaged or worn-out threads in metal, wood and plastic without the need for special taps or installation tools. Our thread inserts are sold through industrial distribution exclusively, offering competitive pricing, low minimums, and cost-effective package quantities. Our line of threaded inserts is carried by every major national MRO distributor in the U.S., as well as by regional and local distributors across the country. Contact us to learn more and find a distributor in your area.