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Using a Loctite® Threadlocker

How Do I Use a Loctite® Threadlocker?

Application Options:

  • For through-holes
  • For blind holes
  • For post-assembly
  • For overhead applications
  • For pre-applied applications
  • IMPORTANT: To achieve optimum performance, all parts must be clean and free of contaminants (e.g., oil, grease)

Dispensing Options:

  • 250 ml and 50 ml push-pull nozzle
  • 250 ml and 50 ml Loctite® hand pumps
  • Loctite® integrated semiautomatic dispenser, dispense valve and stationary dispense valve
  • For more information, visit

When Should You Use a Loctite® Primer?

To Speed Up Cure
Significantly speed up the cure time of Loctite® threadlockers when assembling metal parts that are cold, have large gaps or deep threads. Not required for primerless products.

For Inactive Metal Assemblies
When assembling metal parts with inactive surfaces, Loctite® primers are recommended to ensure proper performance of Loctite threadlockers. Not required for primerless products.

*Inactive Metals
(Primers Recommended)
*Inactive Metals
(Primers Recommended)
 Active Metals
(Primers Optional)
Plated Parts Magnesium Iron
Anodized Aluminum Natural or Chemical Black Oxide Plain Steel
Titanium Magnetite Steel Copper
Stainless Steel Inconel Brass
Galvanized Steel Silver Bronze
Zinc Gold Manganese
Pure Aluminum   Monel
 Cadmium   Kovar

* Loctite threadlockers cure in the absence of air and presence of metal ions. When assembling inactive metal parts, which are low in metal ions, the use of Loctite primers is recommended to ensure proper performance of Loctite threadlockers.

Loctite Threadlockers - 4 colors
LOCTITE® Threadlockers by Color

Discover the difference between Red, Blue, Green, and Purple Threadlockers

Learn More...

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