Studbolts are fasteners used in a variety of industrial applications.
A stud bolt is a threaded rod with 2 loose nuts.
To ensure that studbolts are permanently resistant to corrosion, abrasion and other environmental influences, they are often coated with special coatings, such as Xylan and Xylar.
Xylan is a dry, thin film coating based on fluoropolymer technology, usually PTFE (polytetrafluoroethylene).
It is applied via spraying or a dipspinning process. Xylan coatings offer excellent properties, reducing friction and preventing jamming of bolts and nuts.
In addition, they have a high degree of corrosion resistance, keeping studbolts protected from rust and corrosion in aggressive environments.
Xylan coatings combined with a galvanic substrate or with a zinc primer can withstand salt spray tests of more than 2,000 hours.
Xylar is a ceramic fluoropolymer coating that provides enhanced abrasion resistance and very high corrosion resistance.
This coating provides protection against degradation from exposure to chemicals, high temperatures and corrosive conditions. Xylar coatings are widely used in demanding industrial applications, such as the oil and gas industry, chemical plants and marine environments, where corrosion resistance is critical.
In addition to its corrosion resistance, Xylar is chemically highly resistant and a very good base to apply a Xylan coating over.
A Xylar + Xylan coating system can withstand salt spray tests of up to 4,000 hours.
In addition to PTFE coatings, graphite and MoS2 coatings can also extend the properties and service life of studbolts.
When selecting the right coating or coating combination for a specific application, it is important to consider environmental factors and other relevant performance requirements.
We would be happy to advise you in detail about the options for coating studbolts.
The properties of Xylan coatings on stud bolts:
- Reduced friction: PTFE has a very low coefficient of friction, making the surface smooth and non-stick.
When PTFE coatings are applied to bolts and nuts, it reduces friction during joint tightening.
This allows bolts and nuts to be tightened or loosened more easily, reducing the risk of jamming or damaging the joint. - Corrosion resistance: PTFE resists corrosion and is not susceptible to attack by moisture, chemicals or salts.
PTFE-coated bolts and nuts reduce exposure to corrosive elements, extending fastener life and improving joint reliability. - Chemical resistance: PTFE is resistant to most chemicals, including acids, alkalis and solvents.
As a result, PTFE-coated bolts and nuts can be used in environments where exposure to aggressive chemicals is a factor, without affecting the fasteners. - Resistance to high temperatures: PTFE retains its properties at high temperatures, making PTFE-coated bolts and nuts suitable for use in applications with elevated temperatures, such as engines, exhaust systems and turbines.
- Anti-jamming properties: PTFE coatings reduce the risk of bolts and nuts seizing due to corrosion or excessive friction.
This is especially valuable in fasteners exposed to extreme conditions for long periods of time, such as in outdoor environments. - PTFE coatings reduce the fretting of stainless steel nuts on stainless steel bolts.
This is also known as cold welding.
The problem of this seizing of the stainless steel bolt-nut connection is a thing of the past with a PTFE coating. - Electrical Insulation: PTFE is an excellent electrical insulator.
Applying a PTFE coating to bolts and nuts can prevent electrical currents from flowing through the joints, preventing stress corrosion corrosion, among other things.
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