Fastener Coatings

SURFACE TREATMENTS

Surface treatments of fasteners can create great oppertunities in various applications.

Increase Corrosion Resistance

In most applications they use zinc plating or hot-dip-galvanising to increase the resistance against corrosion, but depending of the grade of the steel other treatments such as zinc-flake coatings can be applied.

#Hydrogen Embrittlement

Reduction of Friction

When a bolt is turned in a nut or treaded hole the two materials will have friction by increased tension to apply the right torque. You need to determine what maximum tension you would like to realise, in this case you can apply a surfacte treatments to reduce the friction to a known (range of) value to calculate the torque.

#Torque and Tension.

Chemical Resistance

To avoid pitting or other (electro)chemical reactions coatings can be applied to increase the chemical resistance.

Appearance or Coloring

Painting heads of screws are well known applications for coloring fasteners to it's surroundings. Facade applications and decking screws in any color is possible. Often applied together with a anti-corrosion protective base layer.

Non Electrical Conductiviness

Steel is electrical conductive by applying a non electrical conductive layer the connection will not guide current any more and is insulated. This can be used for different materials used in one construction to avoid galvanic corrosion.

Prevent from Galling

When Stainless steel fasteners are plain used galling can occur. Galling is the 'cold-welding' of a bolt and nut together. Grinding the connection off is the only way to loosen the connection.

Speeding up stainless steel fastener connections you need to apply a surface treatment to avoid galling.