How to Apply LOCTITE® Threadlocker

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How Do I Use a Loctite® Threadlocker?

For Assembly:

  • For best results, clean all surfaces (external and internal) with a LOCTITE® cleaner and allow to dry.
    If the material is an inactive metal or the cure speed is too slow, spray all threads with an activator such as LOCTITE® 7471 or 7649 and allow to dry.
  • Shake the product thoroughly before use.
  • To prevent the product from clogging in the nozzle, do not allow the tip to touch metal surfaces during application.
  • For thru holes, apply several drops of the product onto the bolt at the nut engagement area.
  • For blind holes, apply several drops of the product down the internal threads to the bottom of the hole.
  • Assemble and tighten as required.
  • For sealing applications, apply a 360° bead of product to the leading threads of the male fitting, leaving the first thread free. Force the material into the threads to thoroughly fill the voids. For bigger threads and voids, adjust product amount accordingly and apply a 360° bead of product on the female threads also.

For Disassembly:

  • Remove with standard hand tools.
  • In rare instances where hand tools do not work because of excessive engagement length or because a high strength product was used, apply localized heat to nut or bolt to approximately 250°C.
  • Disassemble while hot.

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

*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

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