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Thread repair - Quick and easy
When fasteners are removed incorrectly or forcefully, the threads can easily become damaged. If this happens, you have two main options: replacing the component or repairing the thread. Whether you should opt for one over the other depends on various factors and needs to be evaluated on a case-by-case basis. However, in most cases, the threads can be restored effectively through repair, ensuring the same level of security and stability as before.
When attempting to repair threads, it’s crucial to use reliable tools and high-quality accessories to ensure a long-lasting connection. In this article, we’ll explore the different methods available for thread repair and discuss the best practices for each approach. You can find all the necessary tools for thread repair in our BAER Tools store.
Damaged Thread – What Causes Thread Damage?
Several factors can contribute to thread damage. Some of the most common causes include:
- Over-tightening of the screw.
- Misalignment of the bolt.
- Corrosion of the thread.
In many situations, replacing the fastening elements outright may not be practical. Therefore, repairing the thread becomes a more logical and cost-effective solution. Before diving into thread repair, there are a few "home remedies" that might help when dealing with jammed or rusted screws:
- Applying a penetrating oil can sometimes reduce friction, making it easier to remove the screw. While this method can work in some cases, it can be time-consuming and isn’t always successful.
- For screws that are stuck due to rust, trying a rust remover might help. However, this method is also time-consuming and not ideal for industrial settings where quick and efficient solutions are needed. A better option in such cases would be to use a repair thread and a high-quality thread repair insert to achieve a stable and resilient fix.
Repairing External and Internal Threads
When it comes to repairing internal threads, durable and corrosion-resistant elements known as thread armor or thread inserts are typically used. Both damaged and torn-out threads can be easily restored using wire thread inserts. This method works for both plastics and metals. You can find the highest quality BaerFix thread inserts and the necessary tools like drills or die stocks in our store!
There are two primary ways to repair threads:
- 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 are possible - 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 be re-cut using a thread cutting die, we’ll focus on explaining the differences and processes for repairing internal threads.
The key factor in choosing the right method for thread repair is assessing how much base material remains. This is important because self-tapping inserts are much thicker (larger external diameter) than wire thread inserts. Let’s take a closer look at both types of thread inserts:
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’re ideally suited for materials with tensile strength up to 450 N/mm². For harder materials, it’s recommended to pre-cut the host thread with a taper tap to prevent excessive material removal during insertion.
Repairing threads using a self-cutting thread insert from BaerFix is quick and straightforward. Additionally, 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 be easily repaired with a wire thread insert. Unlike self-tapping inserts, the thread remains unchanged when using wire thread inserts. This makes it possible to repair threads even in tight spaces. Wire thread inserts require less base material, allowing for shorter fastening solutions and resource savings. The repaired thread achieves improved surface quality and high corrosion resistance thanks to the stainless-steel insert.
Both methods are cost-effective and environmentally friendly compared to complete replacement.
Repairing Damaged Threads Using Wire Thread Inserts and Self-Tapping Inserts
Repairing threads using either method is simple and efficient. If you encounter any issues, feel free to reach out to us for assistance. We’ve also created informative videos to guide you through the process, 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 wire thread inserts, thread taps, insertion tools, and tang break-off tools.
Repairing Threads with Self-Tapping Thread Inserts:
This method is even quicker than using wire thread inserts but is only suitable for materials with tensile strength up to 450 N/mm².
Steps to follow:
- Drill a larger core hole.
- Place the threaded insert on the appropriate inserting tool and secure 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 find the necessary installation tools and accessories for this process in our store.
And don’t forget to check out our informative videos on YouTube for step-by-step guidance!