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Extension springs
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What are the parameters of tension springs?
The tension springs consist of a number of parameters:
| Parameter | Meaning: |
| D | Wirethickness |
| Dm | Diameter center to center |
| Di | Inner diameter (Dm- d) |
| Du | Outer diameter (Dm + d) |
| Lo | Untensioned length |
| Ln | Maximum tensioned length |
| Lk | Length of the body |
| Fo | preload |
| Fn | Force at tensioned length in N |
| Sn | Extraction at force Fn |
| C | Force gain per mm |
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What eyes on extension springs are there?
The eyes of springs depends on the application. At Inexal we recommend using German eyes for most applications.
The different types of eyes on springs are:
- German eyes (half, whole, double)
- Hook eyes
- English eyes (half, whole, double)
- Bolted yes
- Without eyes
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