Fervi Thread Repair Kit | Fix That Stripped Bolt for Good 2026

One of the biggest headaches in mechanical maintenance and repair is a stripped female thread—especially when it’s not a nut but a thread embedded in a part of an object. The usual fix of drilling and tapping to a larger size forces you to also upsize the bolt, and even if the assembly allows it, the result almost always looks wrong.

As a permanent solution to these problems, Fervi offers a wide range of thread repair kits designed to handle the most common situations. We tested the Fervi F-Coil Metric Thread Repair Kit (art. E010), which contains 5 complete sets for repairing M5, M6, M8, M10, and M12 threads.

Let’s take a look at how this “magic box” works and what it contains. The procedure involves enlarging the hole to insert a threaded insert, which restores the workpiece to its original state, ready to accept the same screw or bolt as before.

Everything You Need for the Repair

For each thread size, the kit includes all the necessary tools: a drill bit, a tap, a installation tool, a break-off tool, and a supply of stainless steel threaded inserts. To do the job, you’ll also need a drill (preferably a drill press for accuracy) and a tap handle, which are not included in the kit.

The process starts by drilling out the damaged thread hole, then tapping a new, larger thread. This prepares the hole for the threaded insert, which brings the hole diameter—and the metric thread—back to the original size. The part can then accept the original bolt, as good as new.

Speaking of getting your workspace ready, having the right home improvement tools and a sturdy work surface makes all the difference. If you’re setting up a dedicated repair area, a proper office chair or workshop stool will keep you comfortable during detailed work.

A Simple and Intuitive Procedure

Using the kit is straightforward, even for DIY enthusiasts. Here’s a quick step-by-step overview:

• Select the correct drill bit for the damaged thread size.
• Drill out the old, stripped thread. A good work light is essential to see clearly.
• Use the included tap to cut a new thread in the enlarged hole.
• Screw a threaded insert onto the installation tool and insert it into the new thread.
• Break off the installation tang using the break-off tool.
• Your original bolt now fits perfectly again.

This kit is a lifesaver for repairing threads in engine blocks, machinery, furniture, and more. For larger projects, consider a shed or greenhouse to store your tools and equipment.

Frequently Asked Questions

What thread sizes does the Fervi F-Coil kit cover?

The kit includes sets for M5, M6, M8, M10, and M12 metric threads, covering the most common sizes for automotive and household repairs.

Do I need any special tools to use this kit?

You’ll need a drill (preferably a drill press) and a tap handle. The kit provides the drill bit, tap, installation tool, break-off tool, and inserts. Good outdoor lighting or indoor lighting helps ensure precision.

Can I use this kit on aluminum or soft metals?

Yes, the stainless steel inserts work well in aluminum, cast iron, steel, and plastic. The repair is often stronger than the original thread.

What if I need to repair a thread on outdoor furniture or a vehicle?

This kit is perfect for that. After repairing, you might want to upgrade your outdoor patio furniture or store your garden supplies in a new storage bench.

Is the kit reusable for multiple repairs?

Absolutely. The tools are durable and can be used many times. You can purchase additional inserts separately for future jobs.

For more serious workshop upgrades, consider adding a TV entertainment furniture unit to your garage or a bookcase shelving unit for manuals and parts. And don’t forget a rug to keep your workspace clean.

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