How and When to Use a Threadlocker: A Guide to Threadlocking Adhesives

What is a thread locker?

Threadlocking adhesives are low-viscosity adhesives applied to threaded assemblies such as nuts and bolts. Threadlockers replace expensive locking methods such as lock and split washers while improving the reliability of threaded fasteners. Threadlocking adhesives also seal and prevent corrosion of threaded assemblies.

How to use a thread locker.

To use, apply a small amount of conductive thread locker or thread locking adhesive to the front threads of the bolt. As the bolt screws into the nut or retaining piece, the adhesive will coat the female threads. For most applications, one drop is sufficient.

When to use a thread locker:

Threadlockers are recommended whenever a threaded fastener will be exposed to vibration or repeated impacts. Even when vibration is not a concern, threadlockers are advised for threaded assemblies that are critical to the product’s structure and function.

Which thread locker should I use?

Threadlockers come in a variety of strengths, colors, and grades. The primary types are based on the strength of the bond and wicking properties: Low, Medium, High, and Wicking.

• Low strength provides a bond that can be disassembled using hand tools, ideal for fasteners that need to be removed routinely.
• Medium strength offers a stronger bond that can be disassembled with power tools, perfect for critical joints that rarely need disassembly.
• High strength provides a permanent bond that can only be disassembled with high heat and power tools, suitable for permanent applications.
• Wicking grades are unique because they can be applied to already assembled fasteners, making them ideal for retrofitting or addressing specific challenges in the manufacturing process.

Thread lockers seal leaks and resist loosening.

Threadlocking adhesives from Hernon Manufacturing cure quickly at room temperature under anaerobic conditions. These adhesives enhance the holding power and reliability of threaded assemblies, ensuring they resist loosening due to vibration or impacts. Additionally, threadlockers seal threads against leaks and contamination, providing a barrier against corrosion and galvanic action.

Explore Hernon’s full range of threadlocker products to find the right solution for your application needs.