Locking by bonding function

To secure a screw assembly, it is not enough to screw on the screw or bolt and then tighten it to the recommended tension. It is also necessary to use a threading locking mechanism to prevent undesired loosening due to vibrations, impact or thermal expansion.

There are many different techniques, but the most common involves placing a drop of thread lock (anaerobic adhesive) on the threading of the threaded mounting hardware: screws, nuts, dowels, threaded stems, stoppers…

This is an efficient thread lock solution as it can be used to glue both parts of the assembly, but it is costly to implement and results may vary.

Liquid thread lock has therefore been replaced, for many applications, by threading pre-coated with adhesive.

This technique involves pre-coating the threaded hardware with a microencapsulated adhesive that only activates during assembly. When the screw or bolt is tightened, the adhesive released by the bursting of the microcapsules mixes with the hardening agent and glues the threaded parts together like a traditional thread lock.

Light thread lock (equivalent to blue thread lock) that can be repositioned several times can also be obtained by depositing a polyamide on the threads of the threaded hardware: More information on the reusable locking function