DOCO International B.V.

+31 (0)46 420 06 66

30-06-2021 New: pre-tensioned springs

We now offer pre-tensioned extension springs, resulting in an easier way to mount a complete HOME-X system.

With other extension spring doors in the market, the complete door leaf weight must be lifted. Our pre-tensioned extension springs make lifting the door leaf a lot lighter, so our HOME-X system can be mounted by only one person. This complies with health and safety regulations and is even possible with our recently introduced HOME-X systems up to 3000 mm high.

The extension springs are pre-tensioned for 85-90% in the factory with specially designed equipment.

We are starting with bulk sales and later this year the pre-tensioned springs will also be available in flatbeds.

Availability depends on country. Please contact your sales manager for more information

How to install a pre-tensioned door

Our HOME-X system with pre-tensioned springs can be installed by only one person within just 10 minutes. The weight of the door is not an issue anymore because the springs carry 85-90% of the load.

Cable set


  • With 2 cable collars to hold the cable in place in the connection adapter
  • Available in different lengths
  • Cable thickness: 2 mm

Connection strip


  • Longer version of the standard connection strip (115052) for pre-tensioning
  • Also available in stainless steel (115064)

Connection adapter


  • Secures cable in pre-tensioned position by hooking collars
  • Not mandatory to discard after installation

Your benefits:

  • Heavy doors (up to 130 kgs) can be installed by only one person
  • Only 10-15% of the door leaf weight has to be lifted
  • Save installation time with our pre-assembled vertical track sets
  • Cable unhooks automatically during the installing of the top panel
  • The safest pre-tensioned system on the market!

Assemble your own pre-tensioned springs

With our specially designed extension spring work bench you can assemble pre-tensioned springs in your own workshop. It is possible to safely tension two vertical rail sets simultaneously.

How does it work?

With our work bench you can easily pre-tension two extension springs at the same time. In this video we explain the tensioning process in a few steps.

If you have any questions about the new spring matrix and how these changes affect your business, please do not hesitate to contact your local sales manager.

Yours faithfully,

DOCO International

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