There are two ways of safeguarding threads which are pre-coated through machine-processing. These are known as adhesive and clamping thread locking technologies
Adhesive Coatings (Micro-encapsulation)
By screwing into the counter thread, the micro-capsules are damaged by pressure and/or sheer stress. Thereby, the adhesives and hardening agents in the capsules are released and mixed in such a way that a chemical reaction occurs. The adhesive is cured and the desired protective effect as well as an additional sealing effect is reached. The curing process begins shortly after assembly. The complete curing process is finished in 24 hours, but can be accelerated by thermostress. Micro-encapsulated thread locks can be used only once.
Requirements acc. DIN 267-27 acc. system
- 3M Scotch Grip 2353, blue
- Precote 80, red
- Precote 85, turquoise
Other, non-standard systems:
Clamping Coatings
For clamping coatings, a type of plastic is applied to one part of the thread which, when assembled, produces a clamping effect. The axial clearance margin between the thread on the screw and that on the nut is filled up by the plastic and achieves in this way a high contact pressure between the two opposite un-coated thread flanks. This type of binding prevents the article from loosening under dynamic loading. Clamping coatings can be used multiple times.
Requirements acc. DIN 267-28 acc. system
- Polyamide - stain/all-round, blue/red
Sealed coatings