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Tension springs

The eyes for tension springs depend on the application. At TEVEMA, we recommend using German eyes for most applications.

The different types of eyes on tension springs are:

  1. German eyes (half, whole, double)
  2. Hook eyes
  3. English eyes (half, whole, double)
  4. Screwed-in eyes
  5. Without eyes

If the eyes on your tension springs always break off, we recommend using screw-in eyes.

Pre-tension on tension springs occurs in the manufacturing process.
With tension springs, the windings of the spring are wound so tightly together that the windings want to slide over each other. This is necessary for tension springs to deliver their pulling power.

Read more about preload on tension springs.

The forces that pull out a tension spring first move through the eyes. The kink that is on the eyes of the tension spring, with which the eyes are connected to the tension spring, receive the force each time. This ensures that spring wear is mainly on the eyes of tension springs. A detailed explanation can be found here.

The tension springs consist of a number of parameters:

Parameter Meaning
D Wire thickness
Dm Diameter center to center
Di Inner diameter (Dm- d)
Du External diameter (Dm + d)
Lo Unstrained length
Ln Maximum stressed length
Lk Length of body
Fo Preload
Fn Force at strained length in N
Sn Extraction at force Fn
C Force increase per mm

Preload on tension springs is the force in N required before the tension spring can stretch. Read more about the origins and handling of preload on tension springs.

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