Thread-locking compound

Thread-locking compound or threadlocker is a single-component adhesive, applied to the threads of fasteners such as screws and bolts to prevent loosening, leakage, and corrosion.

Most thread-locking compounds are methacrylate-based and rely on the electrochemical activity of a metal substrate to cause polymerization of the fluid. It can be permanent or removable; in the latter case, it may be removable merely by force or may also require heating, for example. Typically, brands are color-coded to indicate strength and whether they can be removed easily or require heat for removal.

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