Extension & Compression Springs: The Differences

Compression springs and extension springs are actually on opposite ends of the spring spectrum, but both types of springs are sold by Houston spring manufacturers. The purpose of extension springs is to hold two different components together, while compression springs keep components from touching in the first place. Elasticity and strength are characteristics of both of these items, but they use two different aspects of potential elastic energy.

Extension
An extension spring is usually crafted from smaller gauge wire and would tightly, and both ends of this spring may have either hooks or loops that can be used for attachment. A good example of an extension-type springs are those found on a trampoline. When the coils of an extension spring are stretch to their limits, it contains the most potential energy; when the springs return to their original position, all of that energy is released. There is a need to watch how far an extension spring is stretched, however, as overextension can cause damage. Once the springs have been stretched past their natural limits, they cannot return to their original condition.

Compression
The design of compression springs means that they work differently, as they are made of larger gauge wire and are not wound into tight coils. These springs often have rings on each end that support their loads. A popular example of a compression spring is a car shock absorber, which is naturally at rest when it is an extended position. In order to experience the most potential elastic energy, the spring has to be pushed together. Another example of this type of spring is a Belleville spring (or Belleville washer) that is actually a disk-shaped product with a curved center. Engineers will often use these springs in many different combinations to duplicate the qualities of other types of springs systems, or when two parts of a single machine need to be protected from unnecessary shock.

Typical Spring Applications

• Compression: Fluid/air control, switches, automotive, aerospace equipment and off-road equipment.
• Extension: Window components, appliances, lawn and garden equipment and other OEM applications.