Protecting and Finishing Surfaces


Surfaces on connection parts are exposed to a whole range of aggravating elements and have to be resistant to:

  • Mechanical strain such as vibrations and scratches
  • Chemical stress from salt water, acid rain, and so on
  • UV radiation
  • Extreme temperature changes
  • Solvents such as oil and gasoline

This is where surface finishing comes in. It is a process that provides connection parts with new or improved features such as better electrical conductivity, coefficients of friction, or wear protection.

Both metallic and non-metallic coatings can be applied. ETTINGER supplies two kinds of metallic coatings:

  • Electroplating in line with EN ISO 4042
  • Chemical nickel plating

Electroplated Coatings

The electroplating process uses electrical current to deposit metals (zinc, copper, nickel, or tin) or metal alloys (zinc-nickel, zinc-iron, or zinc-cobalt) on the steel surface. The color of the metal layer can then be changed by means of passivation or sealing.


  • Excellent corrosion protection
  • Thin coatings (3–15 μ)
  • No need to recut threads
  • Color stability

Chemical Coatings

Chemical treatments use an electroless chemical coating based on an aqueous nickel saline solution. The lack of current means that it is possible to coat even non-conductive parts.


  • Outstanding corrosion protection
  • Even coating distribution, including on internal surfaces with low coating tolerances
  • Coatings adhere to contours without build-up at edges
  • Coating thicknesses can be adjusted easily
  • Wear-resistant
  • Good chemical resistance
  • High degree of hardness


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