Thread unscrewing units


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. Thread unscrewing units 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 molds 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 thread unscrewing units 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 thread unscrewing units which significantly reduces cycle times and ensures a higher level of thread quality. The result is faster and more efficient production.

Unscrewing molds für internal threads, montage


  • 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)


  • 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 thread unscrewing units available
  • Custom designs possible thanks to modular system
Thread unscrewing units

Thread unscrewing units

PDF open

Forme - Thread unscrewing units

Forme - Thread unscrewing units

PDF open

Temperature filter

Temperature filter

PDF open

Core cooling

Core cooling

PDF open

Tobias Hartung

Phone +49 6655 9636-37


Contact Austria

Ramseier Normteile GmbH

Roman Rath

Gewerbestraße 14
A-5301 Eugendorf
Phone +43 (0) 6225 20 100 0

Contakt Canada & USA

DMS – Your Innovative Edge

Mike Hicks

1875 Blackacre Drive
Oldcastle, Ontario N0R 1L0
Phone (519) 737-6743 800-265-4885
Fax (519) 737-6744 800-845-3807

17197 Newhope Street, Unit I
Fountain Valley, California 92708-4228
Phone (714) 751-1615 800-421-3993
Fax (714) 751-3861 800-953-9561

1026 National Parkway
Schaumburg, Illinois 60173-4519
Phone (847) 885-6007 888-766-8006
Fax (847) 885-6075 800-367-4199

Contact Czech Republic

CECHO – Bohumil Cempírek s.r.o.

Tomáš Filippi

Polnička 309
591 02 Žďár nad Sázavou
Phone +420 566 620 705

Contact Switzerland

E. Ramseier Werkzeugnormalien AG

Daniel Jenny

Dübendorfstrasse 27
CH-8602 Wangen bei Dübendorf
Phone +41 44 834 01 01

Contact Spain

Bru y Rubio S.L.

José M. Pascual de Bonanza

C/ Huelva, 19
Pol. Industrial L'Alfaç II
Phone +34 96 555 31 99


Verband Deutscher Werkzeug-
und Formenbauer e.V.