Machine-processed pre-coatings have several benefits. These coatings are permanently applied, reducing human error in the production phase. Moreover, the cleanliness and orderliness of your work areas is guaranteed. You only have to pay attention to the availability of a single part and not various components. The parts are delivered pre-assembled and ready to use in your production.
Basically, one distinguishes in machine-processed pre-coatings as safety or sealing products.

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:

• Precote 30, yellow

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

In sealing coatings, there are two variations – thread sealing and sealing directly underneath the head

In thread sealing, a film-based dispersion of non-reactive mineral solid matters is added to the thread. This is a nontoxic, hygienic and harmless pre-coating for immediate sealing of cylindrical and conical threads.  This is a non-stick film.
Bei Gewindedichten wird eine filmbildende Dispersion aus nichtreaktiven mineralischen Feststoffen auf das Gewinde aufgebracht. Es ist eine ungiftige und gesundheitlich unbedenkliche Vorbeschichtung zum sofortigen Abdichten von zylindrischen und konischen Gewinden. Der Film ist nicht klebrig.   

Systems

• Precote 4, white
• Precote 5, white
• Precote 6, white
• Precote 9, red-brown

Sealing directly underneath  the head

Sealings which are fused onto the surface of metallic parts, directly under the screw’s head. This makes O-rings obsolete.  Under head sealing can be used multiple times (depending on loading)

Systems

• GESI-Nylon sealing ring
• GESI-Seal, green
• Nyseal, green/colorless