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A Guide to Thread-Locking Fluids

When it comes to securing threaded fasteners such as bolts or screws, one essential tool in any mechanic's arsenal is thread-locking fluid. Thread-locking fluid is a type of liquid adhesive that helps prevent fasteners from loosening or accidental disassembly due to vibration, shock, or other external factors. In this guide, we will explore the benefits of using thread-locking fluid over other types of adhesives and provide some insights into their various applications.

Thread-locking fluid works by filling the gaps between the threads of a fastener and the preformed hole of a workpiece, creating a secure bond that resists rotational forces. This is particularly important in applications where vibrations or dynamic loads are present, as they can cause fasteners to become loose over time, leading to equipment failure or safety hazards.

Different Types of Thread-Locking Fluids

There are different thread-locking fluid types available, each of which is designed with specific applications and requirements in mind. The most common variants include:

  • Permanent thread-locking fluid is designed for fasteners that need to remain permanently secure. It provides the highest level of locking strength and is resistant to extreme temperatures, chemicals, and other environmental factors. To remove fasteners secured with permanent thread-locking fluid, heat and high torque are usually required.
  • Removable thread-locking fluid, as the name suggests, allows for the easy removal of fasteners when needed. It provides a strong locking force but can be easily undone using standard hand tools without the need for excessive force or heat. As such, this type of fluid is often used in applications where periodic maintenance or disassembly is required.
  • Wicking thread-locking fluid is specifically formulated to penetrate the threads of pre-assembled fasteners. Generally, it is applied to the exposed threads, and the capillary action draws the fluid into the threads, securing the fastener in place. For this reason, wicking thread-locking fluid is ideal for use in hard-to-reach areas or for fasteners that do not require frequent disassembly.

What to Consider When Using Thread-Locking Fluid

Now that we understand the different types of thread-locking fluids, let us discuss some key considerations when using them:

  • Cleanliness: Before applying thread-locking fluid, it is crucial to ensure that the fastener threads and the receiving hole are clean and free from dirt, oil, or other contaminants. Any residue on the surfaces can interfere with the adhesive properties of the fluid and compromise its effectiveness.
  • Application: Thread-locking fluid must be applied sparingly, ensuring that it only contacts the threads of the fastener and the receiving hole. It is worth noting that excessive fluid can lead to overfilling and potential leakage, which may interfere with the fastener's engagement.
  • Curing time: Typically, thread-locking fluid requires some time to fully cure and achieve maximum strength. Before subjecting the fasteners to any loads or vibrations, you must follow the manufacturer's instructions regarding the recommended curing time.
  • Compatibility: Ensure that the chosen thread-locking fluid is compatible with the fasteners and the surfaces it will come into contact with. Some fluids may not be suitable for use with certain plastics, rubber, or other sensitive materials, as they can cause damage or corrosion.


In conclusion, thread-locking fluid is a valuable tool for maintaining the integrity and reliability of threaded fasteners. Whether you are working on a small DIY project or tackling complex machine repairs, using the appropriate type of thread-locking fluid can help prevent loosening and enhance safety. By incorporating thread-locking fluid into your assembly process, you can ensure that your fasteners stay securely in place, providing peace of mind and reliable performance.

At NSN 360, we have a wide selection of thread-locking fluids that meet the needs of various applications. With countless options at unbeatable price points, customers can easily meet their rigid operational constraints. To learn more about NSN 360’s capabilities, we invite you to contact us via phone or email today; we are available around the clock for customer inquiries. Alternatively, if you would like more information on any listing in our inventory, fill out and submit an RFQ form through our website.


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