Modern fasteners increasingly must meet requirements that go far beyond mere mechanical strength. Bolts, nuts, and washers operate in environments exposed to moisture, salt, fluctuating temperatures, and aggressive weather conditions. This is precisely why flake coating—a modern anti-corrosion protection technology widely used in industry and construction—has gained immense popularity.
What is flake coating?
Flake coating is a non-electrolytic anti-corrosion coating based on zinc and aluminum flakes bonded with an organic or inorganic binder. Unlike traditional galvanizing, FLZ coating does not form a single, compact layer, but rather a structure composed of microscopic flakes that overlap, creating a highly effective protective barrier.
These types of coatings are widely used on structural screws, in the automotive and machinery industries, nuts and washers, especially where high corrosion resistance is important without affecting the mechanical properties of the component.
How does FLZ flake coating work on screws and fasteners?
The FLZ coating affects fasteners on several key levels, significantly improving their durability and functionality.
Effective anti-corrosion protection
Zinc and aluminum flakes create a multi-layer barrier that blocks moisture and oxygen from reaching the steel. This allows FLZ-coated screws to achieve very high resistance to salt spray tests, often significantly exceeding traditional zinc coatings.
No risk of hydrogen embrittlement
Because flake coating is a non-electrolytic process, it eliminates the risk of hydrogen embrittlement. This is a huge advantage for high-strength screws, where traditional electro-galvanizing can be problematic.
Stable thread parameters
FLZ creates a thin, even coating that doesn't distort thread geometry. This ensures that screws maintain full compatibility with nuts, ensuring smooth assembly without the risk of galling.
The influence of FLZ on the assembly and operation of the bolted connection
Flake-coated fasteners offer a number of practical benefits during installation and operation:
- long-lasting protection even after years of use.
- more predictable tightening torque,
- less risk of thread seizure,
- easier screwing and unscrewing of connections.
Where are FLZ flake coated screws used?
FLZ flake coating is used wherever standard anti-corrosion coatings are not sufficient:
- steel structures and load-bearing connections,
- automotive industry,
- energy and infrastructure industry,
- external installations exposed to weather conditions,
- machinery and heavy industry.
Thanks to its high resistance and stable technical parameters, FLZ has become one of the most frequently chosen coverings in modern engineering projects.
The visual aspect of the FLZ flake coating
In addition to its technical properties, FLZ flake coatings also boast a highly aesthetic appearance, which is increasingly important in modern structures and architectural projects. The most common is an elegant, uniform gray coating, which gives screws and fasteners a modern, technical character. Black coatings are also increasingly popular, used where visual consistency, aesthetic detail, or discreet integration of fasteners into the structure are important. In both cases, the FLZ coating is uniform, matte, and durable, ensuring screws maintain their aesthetic appearance for a long time, even under harsh operating conditions.
Why choose FLZ coated fasteners from Eurobolt?
By choosing FLZ flake coated fasteners from Eurobolt, you gain access to proven solutions that meet the requirements of modern construction and industry. Eurobolt offers a wide selection of FLZ coated screws, nuts, and washers, expert technical advice, and support in selecting the right solution for specific environmental and standard conditions. This guarantees that your connections will be durable, safe, and resistant to time and operating conditions.
Summary – why choose flake coating?
Flake coating significantly increases the durability of screws and other fasteners, providing them with high corrosion resistance, no risk of hydrogen embrittlement, and stable assembly properties. This solution combines safety, reliability, and long service life of connections, even under the most demanding operating conditions.
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