How to prevent fastener loosening? The answer lies in pre-applied treatments

Threaded fasteners are critical elements in any mechanical system. Their loosening can cause vibrations, loss of sealing, malfunctions, and machine downtime. Dynamic loads, thermal cycles, or imperfect mating surfaces can compromise long-term reliability.

Even with proper assembly, threaded fasteners can lose effectiveness over time. The use of washers, threadlockers, or sealants during assembly can improve the situation but involves additional time, introduces variability in application, and increases indirect costs.

One of the most effective answers to this problem is the use of pre-applied treatments on screws, studs, and metal fasteners. These are chemical coatings that lock, seal, and protect the thread at the time of installation, optimizing performance and productivity.

These treatments can:

• lock the thread (microencapsulated adhesives)
• resist vibration and shock (polyamide-based locking compounds)
• seal against pressurized liquids and gases
• protect threads from corrosion or damage

Pre-applied solutions by Berardi Group

Berardi Group offers a complete range of pre-applied solutions on screws and small metal parts, with treatments compliant with DIN 267/27 and 267/28 standards. The offering includes:

• Pre-applied adhesives: microcapsules with locking effect, available in different strength levels (low, medium, and high) and compliant with DIN 267/27. They are designed to lock and seal all types of threaded connections, suitable for both metal and plastic applications.

• Pre-applied locking agents: polyamide-based locking coatings compliant with DIN 267/28, immediately effective and reusable for later adjustments. During tightening, the product fills the gaps between the screw thread and nut, increasing metal-to-metal contact and providing strong, long-lasting resistance to loosening and vibration. In the 360° capsule version, it also acts as a sealant for low-pressure fluids.

• Pre-applied sealants: high-performance microcapsules suitable for threaded connections that must withstand high pressure. Compliant with DIN 267/27, they can be applied to both cylindrical and conical joints, adapting to all types of metals and most plastics.

• Pre-applied protective coatings: designed to protect threads from unwanted adhesion of primers or welding residues, these coatings preserve the integrity of the component without altering its mechanical properties. Thanks to low application temperatures, they ensure protection without affecting the thread geometry.

Berardi pre-treated components make assembly faster, eliminate the need for auxiliary materials such as liquid threadlockers or O-rings, and ensure consistent quality of the threaded joint. They are ideal for integration into automated production lines and all applications where reliability and speed are essential.

A technical partner for the fastening industry

With over 100 years of experience, Berardi Group is a benchmark in industrial fasteners, offering a product range that includes:

Custom screws and bolts
Security screws
Captive screws
Custom springs
Anchors and fasteners
Clamps and much more.

Visit the Berardi Group's online stand and request a consultation on pre-applied solutions for your production.