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Extention Springs

An extension spring is a spring that becomes longer when pulled and then returns to its original shape. At Roveron, we offer high-quality springs in various sizes, shapes, and materials. Our metal extension springs meet the highest quality standards and are suitable for a wide range of devices and machines.

What Is an Extension Spring?

An extension spring is made from coiled spring steel and is designed to absorb force when stretched. The tensile force increases as the spring is extended further. Extension springs are characterized by their diameter, wire thickness, spring length, pitch, and type of end loops.

What Types of Extension Springs Does Roveron Offer?

At Roveron, we offer the following types of extension springs:

  • With German loops
  • With English loops
  • With double loops
  • With single loops
  • With hooks
  • With D-loops
  • With loose loops
  • With threaded plugs or threaded ends on both sides

If you would like to modify a spring, that is possible. The spring can be made stronger, lighter, longer, or shorter. The design can be adjusted in consultation with you.

We assess whether the spring is suitable for the desired modifications and verify whether the expected service life can be achieved.

Material Selection

Material selection is crucial. At Roveron, we work with various materials depending on the application and the desired service life.

Popular materials include:

  • Spring steel (Class C) – Strong and cost-effective, perfect for standard springs.
  • Stainless steel (SS) – Corrosion-resistant and ideal for humid environments.
  • Titanium – Lightweight, strong, and corrosion-resistant; ideal for aerospace applications.
  • Exotic materials – Copper, aluminum, brass, and others for specific applications.

Below you will find an overview of commonly used exotic materials that we keep in stock.

Materials

Material
Material Number
Class-C steel
1.1200
Stainless steel (301, 316)
1.4310 / 1.4401
Inconel (X750, 718, 625, 600)
2.4669 / 2.4668 / 2.4856 / 2.4816
Hastelloy (C4, C276)
2.4610 / 2.4819
Titanium (grade 1, 2, 3, 4, 5)
3.7025 / 3.7035 / 3.7055 / 3.7165
Nimonic 90
2.4632
Beryllium copper
2.1247
Phosphor bronze
2.1020
Brass
2.0321
Monel
 2.4360
Phynox / Elgiloy
2.4711

Extension Spring Lengths

We also offer extension springs in continuous lengths (spring coils by the meter), allowing customers to experiment with different lengths. Longer extension springs are often used as anti-kink springs or protective springs.

For extension springs, uncoated Class C spring steel is typically used due to its high strength and relatively low cost. Stainless steel is also popular because of its corrosion resistance. In addition, we supply extension springs in exotic materials such as titanium, copper, aluminum, brass, and many more. Titanium extension springs are lightweight and corrosion-resistant, making them suitable for aerospace applications.

Operating Temperature

Do you require springs that can withstand extreme temperatures? At Roveron, we supply springs suitable for temperatures ranging from -200°C to +1000°C. Please consult our website under the materials section for more information about the specific operating temperature per material type.

Treatment of Extension Springs

Do you have an existing spring that needs modification? At Roveron, we design your extension spring entirely to measure. We evaluate the specific requirements of your desired spring and ensure that your metal spring delivers the correct service life and performance.

We offer custom options such as:

  • Adjustment of length, diameter, and wire thickness
  • German loops, English loops, double loops, or special hooks
  • Treatments such as galvanizing, powder coating, chemical blackening, and shot peening

Applications

Our extension springs are used across a wide range of sectors and technologies — from mechanical engineering to lighting and medical systems. Do you have a specific challenge or technical requirement? Contact us for custom compression springs tailored to your situation.

We supply extension springs for, among others:

  • Offshore
  • Hydraulic systems
  • Packaging materials
  • Agrotechnology
  • Machine building
  • Lighting technology
  • Food processing industry
  • Valves and fittings
  • Design offices
  • Metal processing industry
  • Garage doors

At Roveron, you will find a wide range of extension springs available directly from stock. Do you have a specific application? We manufacture custom extension springs quickly and with the quality you expect from us.

Contact us for advice or a no-obligation quotation — we are happy to think along with you.

 

Extension Spring

Extension Springs

  • Available in all materials.
  • Also available in Inconel 718.
  • We deliver custom-made and from stock
  • Fast delivery, competitively priced!

Frequently Asked Questions About Extension Springs

Is your question not listed here? Feel free to contact us without obligation, our team of experts will be happy to assist you.

An extension spring is designed to extend under load and return to its original shape when the force is removed. These springs are used to create tension or to pull objects together. Extension springs store energy when they are stretched and release this energy when tension is reduced. They are essential in many mechanical applications where elastic deformation and energy storage are required.

Extension springs are used in various industries and applications, such as in the automotive industry for accelerator pedals and trunk latches. They are also crucial in household appliances such as washing machines and in sports equipment like trampolines. In addition, extension springs can be found in industrial machinery, agricultural equipment, and even medical devices. Their ability to exert force makes them indispensable in situations where constant tension or repeated movement is required.

The main difference between the two types of springs lies in their working mechanism. Extension springs become longer when force is applied. They pull objects toward each other. Compression springs are compressed under load. They push objects apart. Extension springs usually have hooks or loops at the ends for attachment, while compression springs often have flat ends. The choice between an extension spring and a compression spring depends on the application and the required force direction within the mechanism.

Smoother movement
Extension springs make movement easier by reducing tension in mechanisms. As a result, less force is required for movement.

  1. Reduced wear
    By lowering tension, pressure on components such as window frames decreases. This results in less wear and a longer service life of the mechanism.

  2. Improved safety
    Extension springs help prevent parts from suddenly slamming shut. This reduces the risk of fingers or hands being caught.

  3. Versatility
    Extension springs are suitable for many situations. They are used in household appliances, industrial machines, and sports equipment, demonstrating their versatility.

  4. Easy installation
    Extension springs are often easy to install and typically require less complex assembly than other types of springs.

These advantages make extension springs suitable for applications involving constant tension, repeated movement, and elastic deformation.

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