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Unscrewing molds are groups of components made for customer-specific applications. They have been on the market in both electrical and hydraulic variants for over 10 years. The Desoi GmbH has been on the cutting edge of this market from the very beginning, both as a manufacturer and patent owner. Unscrewing molds provide a simple, inexpensive, and highly-reproducible solution for plastic or MiM components requiring internal threading. The molds can be integrated directly into or onto the injection tool and can be operated using the system's existing hydraulics.

The electrical variant using modern servo technology and custom controller is the appropriate solution when electrical injection equipment is in use. The stroke path is defined using a control thread unit made especially for the part by Desoi. The mold's motion can be controlled by the injection equipment's integrated control processor. The fixed motion limit provided by the tool ensures highly reliable and reproducible precision. For most of our unscrewing molds the control thread unit can be rotated, allowing the thread start point to be adjusted as required. If a part is to be produced with different threads using the same tool, then separate control thread units can be purchased and swapped out as required.

An active core cooling option is available for the unscrewing mold which significantly reduces cycle times and ensures a a higher level of thread quality. The result is faster and more efficient production.


  • High unscrewing speeds of up to 
2000 rpm
  • Torque of up to 88 Nm
  • Hydraulic motors with 2.6 kW; 3.2 kW; 6.1 kW and up to 10 kW
  • Servomotors available
  • Various unscrewing stroke lengths available, 0 - 120 mm
  • Choice of different axis spacings
  • Different sizes of unscrewing molds available
  • Custom designs possible thanks to modular system


  • Modular system
  • Simple solution
  • Reduced design costs
  • Spare parts available quickly
  • Replaceability
  • Flexibility (eg. same product but with a different pitch or starting point, 
just by swapping control thread unit)