Common threadlocker mistakes to avoid

When bonding any two surfaces, having the right tool for the task is vital. This is particularly true when working with threaded assemblies.

Fasteners face tough conditions, including vibrations, environmental extremes, and shocks, making them prone to loosening and leaks. LOCTITE^® threadlockers offer decades of high performance, but proper application is key for success in securing threaded assemblies.

Improper use of a threadlocker can impact its performance. Before you apply any type of threadlocker, take the time to understand:

• The properties of the threadlocker being used
• Where you intend to apply the threadlocker
• Best practice application

Failure to understand the why, what and how can lead to some of the most common threadlocking mistakes.

At LOCTITE, our experts help you choose the right threadlocker, avoiding common mistakes. Threadlockers vary by strength, temperature range, and thread size. Don't assume the most powerful is always best; red threadlockers are for strong, permanent applications. Misusing them can lead to issues, as they often require heat for removal. Understand threadlocker colors to make the right choice.

If you're new to threadlockers, avoid using too much product, thinking it'll improve reliability. In reality, excess adhesive can spread beyond needed areas and not cure properly. To ensure a strong bond, apply a minimal amount precisely where it's needed, even with low-strength products.

While LOCTITE threadlockers can handle oil and contaminants, it's crucial to prepare properly. Clean the surface before applying threadlocker to prevent contaminants from interfering with curing. Grease, dirt, or oil in the assembly can slow curing, leading to a weak bond.

LOCTITE threadlockers fully cure in 24 hours, and each product has a specific curing time noted in its technical data sheet (TDS). Curing time is distinct from fixture time, which is the point of initial handling strength. Attempting to speed up curing or using the assembly before full curing can cause fastener loosening.

When repositioning an assembly with applied threadlocker, it's a common misconception to think it's safe because it hasn't cured. However, doing so can lead to threadlocker failure. Rotating the fastener during the initial anaerobic reaction breaks chemical bonds irreparably. To reposition, remove and reapply threadlocker, or use a wicking grade threadlocker after assembly is set.

Threadlockers are designed for effective yet removable assembly holding. Low and medium-strength types can be removed with hand tools. Red threadlockers often require heat for safe disassembly to avoid damage. Refer to our guide for proper removal. Contact us for expert advice on selecting the right threadlocker or explore our full LOCTITE range.