If you’ve ever had a screw loosen over time or a bolt back out of place, you know how frustrating it can be. Threadlocker is a simple and effective way to prevent this. Used by professionals in automotive and machinery work, threadlocker is also a valuable tool for home DIYers. It’s a liquid adhesive that locks threaded fasteners in place, preventing them from vibrating loose or shifting under pressure.
This guide breaks down what threadlocker is, the different types available, and how to use it properly in your next repair or build.
What Is Threadlocker?
Threadlocker is an anaerobic adhesive applied to the threads of screws and bolts. It cures when confined between metal surfaces in the absence of air, creating a bond that resists loosening from vibration or temperature changes. It comes in different grades, each designed for specific levels of strength and removability.
Types of Threadlocker by Strength
There are several common types of threadlocker, usually identified by color:
Red: High-strength, permanent. Best for heavy-duty applications like engine components, suspension bolts, or long-term assemblies. Requires heat to remove.
Blue: Medium-strength, removable with hand tools. Ideal for household repairs, automotive bolts, and machinery that may need to come apart later.
Purple: Low-strength, for small fasteners like electronics or delicate assemblies.
Green: Wicking grade, applied after assembly. Best for securing already-installed fasteners without disassembly.
Where You Can Use Threadlocker at Home
- Door hardware and knobs that keep loosening
- Bicycle bolts and brackets
- Lawnmower or small engine parts
- Garage tool racks and shelves
- Furniture that’s assembled with metal bolts
In any case where metal fasteners are exposed to motion, heat, or repeated use, threadlocker can help maintain a tight, safe fit.
How to Apply Threadlocker
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Clean the bolt and threaded hole with a degreaser to remove oil, dirt, or residue.
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Shake the threadlocker bottle well.
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Apply a small amount of liquid to the threads of the bolt.
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Assemble the parts as normal and tighten to the recommended torque.
- Allow it to cure. Most threadlockers fully cure within 24 hours, though some set in minutes.
Types of Anti-Seize Compounds
- Copper-based: Great for high-temperature areas like exhaust systems and brake components.
- Aluminum-based: General-purpose and more electrically neutral, safe for most metal fasteners.
- Nickel-based: Used for stainless steel and in high-heat applications; ideal for dissimilar metals.
- Non-metallic: For use on plumbing or sensitive assemblies where metallic particles may cause issues.
Tips for Best Results
- Use low-strength grades for small screws to avoid stripping.
- For disassembly, heat may be required with high-strength red threadlocker.
- Store in a cool, dry place with the cap tightly sealed.
Recommended Products
Explore OneSource’s selection of threadlockers in different grades:
Shop Threadlockers: https://onesourcesupplyco.com/products/sealants-adhesives-rtv-silicones-epoxies-lubricants-anaerobics-cyanoacrylates-12
Conclusion
Threadlocker is one of those small tools that can make a big difference. It prevents loose bolts, extends the life of repairs, and adds peace of mind to anything you build. If you’re doing mechanical or metal-based work around the house, keeping a few bottles of threadlocker on hand will save time and frustration later.
