Common Threadlocker Mistakes to Avoid

When assembling threaded components, having the right product—and using it correctly—is critical. LOCTITE® threadlockers offer trusted, high-performance solutions to prevent fasteners from loosening under stress. But even the best products can underperform if applied incorrectly.

Here are some common threadlocker mistakes to avoid and tips to ensure optimal results.

1. Using the Wrong Threadlocker

Not all threadlockers are created equal. They vary in strength, temperature resistance, and recommended thread size.
A common mistake is assuming stronger is better. For example, red threadlockers are high-strength and often require heat for removal, making them ideal for permanent assemblies—but problematic if disassembly is needed.

Solution:
Understand LOCTITE’s color-coded system and choose the correct product for your specific application. When in doubt, consult the product’s technical data sheet or reach out to an expert.

2. Overapplying the Product

More isn’t better. Overusing threadlocker can cause overflow, prevent proper curing, and weaken the bond.

Solution:
Apply a small amount directly to the threads—just enough to fill the gaps. Even low-strength threadlockers work effectively when used properly.

3. Skipping Surface Preparation

While LOCTITE threadlockers are designed to perform well even on oily surfaces, neglecting basic preparation can still affect performance. Dirt, grease, and oil can slow curing and reduce bond strength.

Solution:
Clean the fastener and threaded hole with a suitable solvent or cleaner before applying the threadlocker.

4. Ignoring Curing Time

Curing is not the same as fixture time. Fixture time refers to when a fastener reaches handling strength, but full cure can take up to 24 hours, depending on the product.

Solution:
Allow the full curing time listed in the product’s TDS before subjecting the assembly to stress.

5. Repositioning During Curing

It’s a common myth that you can adjust a fastener after applying threadlocker, as long as it hasn’t cured. But turning the fastener during the anaerobic curing process disrupts the chemical bonding and can result in failure.

Solution:
If you need to reposition, remove the fastener entirely, clean it, and reapply threadlocker. Alternatively, use a wicking grade product that can be applied after assembly.

6. Using the Wrong Tools for Disassembly

Threadlockers are designed to be removable—but only with the right tools.
Low and medium-strength threadlockers typically come apart with hand tools, but high-strength red threadlockers may need heat for safe disassembly.

Solution:
Refer to the product guide or consult an expert to determine the correct removal method and avoid damaging components.

Need Help Choosing the Right LOCTITE Threadlocker?

We’re here to help. Whether you're unsure about product selection or run into application issues, contact our experts or explore the full LOCTITE® range for reliable solutions.

Key Takeaways:

• Match the threadlocker to the job.
• Use just enough product—don’t overapply.
• Clean surfaces before use.
• Allow full curing before using the assembly.
• Never adjust fasteners mid-cure.
• Use proper tools for removal.

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