Loctite Threadlocker Blue 242

Available Sizes: 0.20 fl. oz.


Color When Dry: Blue



Where to Buy


Loctite® Threadlocker Blue 242®

Nut and Bolt Locker

Safety Precautions

Keep out of reach of children.


Protect work area. Parts to be sealed must be clean and dry. Shake the product thoroughly before use.
Note: To prevent the product from clogging in the nozzle, avoid touching the bottle tip to the metal surface.


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.

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.

Assemble parts and tighten as required. Sets in approximately 10 minutes and fully cures in 24 hours.


Clean adhesive residue immediately with a damp cloth. Cured product can be removed with a combination of soaking in methylene chloride and mechanical abrasion such as a wire brush.

For disassembly, shear with standard hand tools and remove with methylene chloride. In rare instances where hand tools do not work because of excessive engagement length, apply localized heat to nut or bolt to approximately 482°F (250°C). Disassemble while hot.