Coil spring for tensile force
Extension spring
An extension spring is a coil spring that generates a counterforce for tensile force. The force of an extension spring increases linearly in response to the stretched distance.
An extension spring differs from compressed coil springs in that the extension spring itself may have initial tension. Initial tension means that the extension spring must be stretched with a specific force before it starts to increase in length.
Extension springs are used in, for example, door locks and agricultural machinery.
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Counterforce for tensile force
Extension spring characteristics
- Extension springs have a linear spring rate
- Generates a counterforce for tensile force
- Can be made with German hooks or English loops
- Can also be made with high hooks for narrow attachment points
- A narrow section of straight wire can be put in the middle of the spring; these are used in brake springs, for example
- Materials include spring steel, oil-quenched spring steel and galvanised, stainless and acid-proof spring wire, as well as other special steels, such as heat-resistant spring steel
- Wire diameters can range from 0.2 to 20.0 mm
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