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Thread repair - Quick and easy
When fasteners are removed incorrectly or forcefully, the threads can become damaged. In such situations, you have two main options: replacing the component or repairing the thread. Deciding which option is best depends on the specific circumstances. However, most components can be restored through thread repair and will hold just as securely afterward.
When repairing threads, it’s crucial to use reliable tools and high-quality accessories to establish a durable connection. In this article, we’ll explain the various methods for thread repair and the best approaches for each. Of course, you can find the right tools for thread repair in our BAER Tools store.
Damaged Thread – What Causes It?
Several factors can lead to thread damage. The most common reasons include:
- Over-tightening the screw.
- Incorrect alignment of the bolt.
- Thread corrosion.
In many cases, replacing the fastening elements is not practical, making thread repair a more logical choice. Before proceeding with repair, some "home remedies" might help with jammed or rusty screws:
Lubricating the screw with penetrating oil can sometimes reduce friction, making it easier to remove. However, this method can be time-consuming and not always successful. Using pliers instead of a screwdriver may work in some cases but is generally only possible with pan-head screws. We’re not big fans of this approach.
For screws stuck due to rust, trying rust remover might help. However, this method is also time-consuming and impractical in industrial settings where quick and effective action is needed. In such scenarios, using a repair thread and a high-quality thread repair insert offers a stable and resilient solution.
Repairing External and Internal Threads
When repairing internal threads, durable and corrosion-resistant elements like thread armor or thread inserts are typically used. Both defective and torn-out threads can be restored using wire thread inserts. This method works for plastics and metals alike. Our store carries top-quality BaerFix thread inserts, along with the necessary drills or tools like die stocks and die holders.
There are two types of thread repairs:
- Repairing external threads (like screws or bolts): This can be done by re-cutting the thread using a thread cutting die.
- Repairing internal threads (like nuts): Two solutions exist: repairing with a wire thread insert (BaerCoil) or a self-tapping thread insert (BaerFix).
Should You Repair Threads with Wire Thread Inserts or Self-Tapping Inserts?
Since external threads can simply be re-cut using a thread cutting die, we’ll focus on the differences and processes for repairing internal threads.
The key in choosing the right method is examining how much base material remains. This matters because self-tapping inserts are thicker (have a larger external diameter) than wire thread inserts. Let’s explore both types of thread inserts in more detail.
1. Self-Tapping Thread Insert for Thread Repair:
Self-tapping thread inserts cut into the existing material, removing some of it in the process. They are ideal for materials with tensile strength up to 450 N/mm². For harder materials, the host thread should be pre-cut with a taper tap to prevent the insert from removing too much material during insertion.
Repairing threads using a self-cutting thread insert from BaerFix is simple and quick. The newly repaired thread is more wear-resistant than the original. This method can also be used for thread reduction.
2. Wire Thread Insert for Thread Repair:
Metal threads with low shear strength can easily be repaired with a wire thread insert. Unlike self-tapping inserts, the thread remains unchanged. Therefore, repairing threads using a wire thread insert from BaerCoil is possible even with limited space. These require less base material, allowing for shorter fastening solutions and saving valuable resources. Additionally, the repaired thread achieves improved surface quality and high corrosion resistance due to the stainless-steel insert.
Both methods save costs and resources, and repair is always more environmentally friendly than replacement.
Repairing Damaged Threads Using Wire Thread Inserts and Self-Tapping Inserts
Repairing threads using both methods is quick and straightforward. If you encounter any issues, we’re always here to help. We’ve also created informative videos to assist you, which you can easily access on YouTube. Below are the links to these videos.
Repairing Threads with Wire Thread Inserts:
- Remove the old thread and drill it out to a slightly larger size.
- Use an EG-tap or STI-tap to cut the host thread for the thread insert.
- With the appropriate insertion tool, simply screw in the thread insert.
- For thread inserts with a driving tang, use it first and then break it off after installation.
In our store, you’ll find both wire thread inserts and thread taps, insertion tools, and tang break-off tools.
Repairing Threads with Self-Tapping Thread Inserts:
This method is faster than using wire thread inserts but, as mentioned earlier, it’s only feasible if there is enough material with a tensile strength of 450 N/mm² or less.
When repairing threads, follow these steps:
- Drill a larger core hole.
- Place the threaded insert on the appropriate inserting tool and lock it with the lock nut (you can choose between a hand inserting tool or a machine inserting tool).
- Screw the thread insert into the hole.
- Loosen the lock nuts and unscrew the insertion tool. Done!
You’ll naturally find suitable installation tools and accessories for this process in our store.
For more detailed instructions, check out our informative videos on YouTube.
[Embedding of relevant YouTube videos]
We hope this guide helps you successfully repair your damaged threads!