Precision in combination with technical cleanliness


At Bohnert, you will find the right combination for all requirements and cleanliness classes for the technical cleanliness of your compression springs, tension springs, torsion springs, bent wire parts, constant force springs and stamped-bent parts.

We have a range of different processes to cover the cleaning requirements of our customers.


  • Dipping
  • Swiveling
  • Ultrasonic
  • Multi-chamber process
  • Drying

Cleaning requirements

  • De-oiling and degreasing before heat treatment
  • De-oiling and degreasing before delivery
  • Removal of dirt and chips
  • Fulfillment of restrictive cleanliness requirements for the automotive and medical industry

The effect of liquid cleaning processes is determined primarily by the solvent power of the cleaning agents used and by the process applied.

Contaminations must be removed and taken away.

To do this, we use:

  • Hydrocarbons

Technical cleanliness is set out in a nutshell down to the lowest level in VDA 19. The washing process is used to systematically minimize contamination risks. This can be documented in the form of a residual dirt analysis.

  • VDA 19
  • Residual dirt analysis

Industry applications


Building services engineering

Consumer goods

Electrical engineering

Mechanical engineering and equipment manufacturing

Medical technology


Precision engineering

Textile industry