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E-Z Coil™ Thread Repair Kits

Don't start your next project without the E-Z Coil™ Thread Repair Kit from E-Z LOK. Our large helix coil kit selection includes all the essential items you need to install and repair tapped holes in softer metal materials like cast iron, mild steel and aluminum.


Depending on your specific needs, we offer both standard and budget-friendly equipment in an assortment of sizes. Each E-Z Coil™ Thread Repair Kit includes a set of inserts, an STI tap and an installation tool; the standard edition also includes a tang break tool and drill.


Each helix coil kit is offered in three separate styles:

  • For spark plugs
  • In metric sizes
  • In inch sizes

In addition to what we offer below, E-Z LOK™ has kits for other applications, such as the E-Z Knife™ Thread Repair Kit for hard wood and E-Z Hex™ Threaded Insert Installation Kit for Soft Wood.


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E-Z Coil™ Threaded Inserts for Metal - Economy Kit

E-Z Coil™ - Economy Kits

Available In:

  • Inch kits from #2 to 1-1/2
  • Metric kits from M3 to M39
  • Spark plug kits from M10 to M18


Kit includes:

  • Threaded Inserts
  • STI tap
  • Installation Tool

E-Z Coil™ Threaded Inserts for Metal - Standard Kit

E-Z Coil™ - Standard Kits

Available In:

  • Inch kits from #2 to 1-1/2
  • Metric kits from M3 to M39
  • Spark plug kits from M10 to M18


Kit includes:

  • Threaded Inserts
  • Drill
  • STI Tap
  • Installation and Tang Break Tool

How does an E-Z coil thread repair kit work?

Our E-Z Coil thread repair kit is designed to be user-friendly and make completing your project as simple as possible. First, drill out the damaged thread with the appropriate drill. Then, tap the hole with the included STI tap. It is important you are using an STI tap. These are designed specifically for coil threaded inserts. Once the hole is tapped, use the included installation tool to wind the insert into place. Apply light downward pressure until the top of the coil is 1/4 to 1/2 turn below the surface. To break off the installation tang, place either the included tang break tool or the installation tool on the tang and then tap down sharply with a hammer.

1. When should I use a helical wire coil kit?

Our helical wire coil kits are best suited for projects involving the following soft metals:

  • Cast iron
  • Mild steel
  • Aluminum

They're specifically designed to install and repair tapped holes and help you work efficiently.

2. What's the difference between economy and standard helical wire coil kits?

Apart from economy kits costing less, there is a slight difference in what the kits offer. Both kits include threaded inserts, STI taps and installation tools, but the standard kits also include a drill and tang break tool.

3. Are helical wire coil threads stronger than other threads?

Helix coil inserts are typically the strongest thread when they are of correct length and fitted properly for a project.