- An integrated system is created where no change in component geometry is needed
- High clamping and retention effect is created
- Better reliability when compared to circlips, spring washers, wire retainers and other so-called “retainers”
- Minimizes human error as product is already precoated
- Provides protection of finishes
- Reduction in assembly time
The Pressure and/or the shear forces produced as the fastener is tightened cause the micro-
capsules to rupture. The adhesive contained in the capsules then combines with a hardener.
This is followed by a chemical reaction (polymerization) and hardening of the adhesive
(adhesive bonding), thereby producing the desired locking effect. Bonding the internally and
externally threaded components in this manner is a reliable way to prevent self-unscrewing
of the threaded connection. The preload force applied here is largely preserved (anti-
Assembly should then be completed promptly after tightening. When the adhesive attains
its full effect and when loading of the connection is possible depends on the type of
This technique involves applying a polyamide to a section of the thread. The axial clearance
between the external and internal threads is filled in by the coating, which results in high
surface pressure between the coated thread and the flanks of the uncoated mating thread.
This creates the desired locking effect. Polyamide precoating is an anti-loss device and is not
aimed at preserving the preload force to greatest possible extent, but rather at preventing
the threaded connection falling apart completely. Multiple use is possible here as long as it
is remembered that the clamping forces are reduced each time.
The application of a layer of polyamide around the shaft of the fastener (360°) also creates a