http://www.ciclipinarello.com/else/garanzie/PinarelloENGLISHweb.pdf
“THREADS, THREAD-LOCKERS, GREASE AND TIGHTENING TORQUES
One of the most debated issues is the coupling of threaded parts; in particular it is debated if threads should be a) degreased or b) lubricated or c) treated with thread-lockers, and what is the proper torque to be applied in each of these cases.
In line of principle, we expect threaded couplings to remain stable/tight over time with no loosening, we expect that they can be taken apart when necessary, we expect that they do not generate noises due to micro-movements of the parts, we expect them not to develop corrosion.
Corrosion, that can be a big problem because it can seize or damage threads, it is frequent between different metals (titanium-aluminum,
steel-aluminum). In the past there were no alternatives and grease was used in the threads, to fulfill all four needs. But grease facilitates
loosening, does not last forever, migrates, changes characteristics, is washed away, does not always offer sufficient corrosion protection, and reduces noises only temporarily.
Thread-lockers have been used for many years in mechanics. What is a thread-locker?
It is a liquid that is applied on the threads during installation and solidifies in the following hours. It is available in many “strengths”, but for the bike it is preferable to use the weak one, Loctite® 222 or Arexons® System 52A22. Thread-lockers offer numerous benefits when used on threaded couplings: 1) prevent undesired loosening without the need to use high tightening torques, 2) prevent corrosion in the interface,
3) prevent any micro-movement with associated noises, 4) they remain stable over time.
Thread-lockers solidify when air is absent, therefore the entire space between the threads must be filled with product, otherwise, if not
enough product is used, it will remain liquid.
Using a thread-locker stronger than recommended can seize the threads, especially bigger diameter threads.”
