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Tension Springs

A reliable source for Tension Springs information and leading Tension Springs Companies & Manufacturers.

Tension springs, also known as extension springs, are helical wound coils that are wrapped together and operate with tension. Tension springs have hooks or loops that are attached to both ends. These hooks help in attachment to other components. Read More…

Tension Springs A tension spring is a tightly wound metal coil that is designed to operate with tension. The spring stretches to a particular length as force is applied to it.
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Leading Manufacturers

Lake Geneva, WI  |  262-249-7854

R&L Spring Company manufactures custom spring and wire formed components for industries such as powersports, automotive, medical devices, and general industrial. Products include compression, extension, and torsion springs, as well as rings, wire forms, fourslide components, and long coils. Wire diameters available from .001" to .750" in both shaped wires and flat stocks. Their experienced team is able to meet the most demanding parts specifications. IATF16949 and ISO9001 certified.

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R & L Spring Company $$$

Spring Grove, IL  |  815-675-1350

All-Rite Spring Company specializes in quick-turn design, prototype, and manufacture of springs and wires of all shapes, sizes, and material types. Typical applications are: Automotive, Agricultural, Consumer Appliance, Industrial, Safety Critical, and other High Functional Value and/or Life Cycle.

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All-Rite Spring Company $$$

Grand Rapids, MI  |  616-591-9524

Apex Spring & Stamping is a certified minority owned company that manufacturers springs, stampings, wire forms, clips, and fasteners. Our core industries include automotive, office furniture, medical, recreational, consumer goods, and appliances. We also specialize in value added assembly and prototyping. Our engineering team will ensure your part is both functional and cost-effective. IATF 16949 Certified.

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Apex Spring & Stamping Corporation $$$

Houston, TX  |  713-849-4000

Coiling Technologies, Inc. has the experience and expertise to design and engineer the custom springs to meet your specific requirements. We are a leading manufacturer of high-tech, specialized springs and we are committed to providing quality products with fast lead times. Our automated process allows us to produce the reliable springs you need.

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Coiling Technologies, Inc. $$$

Chicago, IL  |  800-969-7884

Sterling Spring has offered high-quality springs since 1953. Our product line includes compression springs, coil springs, torsion springs, extension springs and industrial springs. We offer just-in-time delivery and cost-effective prices, regardless of your ordering volume.

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Sterling Spring Corp. $$$

Glenshaw, PA  |  412-684-1201

Diamond Wire Spring Company is a designer and manufacturer of precision springs. We have over 75 years of experience in stock and custom springs. Our founding principles of providing quality products and strong, personalized customer service help us earn the trust of our customers. We have more than 11,000 different springs available. We serve many industries including power and energy, agriculture and rail, and many others. Call us today!

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Diamond Wire Spring Company $$$

Bristol, CT  |  860-582-6368

Our springs are made of a variety of materials and can be used in many different applications. Pa-Ted manufactures custom designed springs for the automotive, electrical, medical, landscaping, pool covers, and original equipment manufacturers industries, and uses materials such steel, beryllium copper, music wire, brass, titanium, tungsten wire, oil tempered wire, and resistance wire. Call us for wire forms today!

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Pa-Ted Spring Co., LLC $$$
placeholder image R & L Spring Company All-Rite Spring Company Apex Spring & Stamping Corporation Coiling Technologies, Inc. Sterling Spring Corp. Diamond Wire Spring Company Pa-Ted Spring Co., LLC

When the tension spring is at rest, it's in its compressed form, but when an external force is applied, it is extended. This extension is resisted by the tension force created in the spring, which pulls back to the original position. The tension of the spring is determined by the load applied to it. The outside diameter, coiling, and wire diameter of the spring determine its tension.

Tension Springs

How Tension Springs are Made

Tension springs are mostly made of metal, and their type depends on the amount of stress it is exposed to and other environmental conditions. The materials that are mostly used are:

  • Copper Alloys
  • Stainless Steel
  • Spring Steel
  • Titanium Alloys
  • Low Alloy Steel
  • Cold Rolled Steel

The manufacturing process of tension springs is done with highly-advanced hot and cold coiling procedures. The wire is bent, heat-treated, and finally finished or coated to protect the spring from corrosion or humidity. Tension coiling machines manufacture springs of dimensions between 0.004 to 1 inch (0.1 to 26mm).

Characteristics of Tension Springs

  • Tension springs stretch and create a load.
  • Tension springs have a little gap between the adjacent coils, and the load is applied along its axis.
  • Tension springs are durable and designed with great precision.
  • These springs have dimensional stability and high tensile strength.

Working of Tension Springs

A tension spring is a helical spring with tightly wound coils. These springs operate under applied tension. When the spring is at rest, no load is attached to its ends; the coils touch each other and are in a compressed shape. When an external force is applied, the spring stretches to a specific length. This means the components attached to spring ends pull them apart, causing tension in the spring. This makes the spring come back to its original position.

Lifespan of a Tension Spring

The lifespan of a tension spring depends on the following factors:

  • Frequency of use
  • Spring application
  • Material of the spring
  • The environment of the spring
  • Amount of the stress that is applie

The lifespan of tension springs is mainly determined by environmental factors. Exposure to sunlight, chemicals, corrosive agents, and water affects the integrity of the metal. Continuous load exposure also causes metal fatigue in the springs, which causes microcracks in its structure.

Types of Tension Springs

Many types of tension springs depend on the type of hooks or loops attached to their ends. These loops differ from one another and depend on the application type. Some of these types are as follows:

  • Machine Hooks

    Machine hooks are the most commonly used ones. It is the strongest of all the hooks because the bend radius is not pronounced. Bending ¾ of the coil can make machine hooks.

  • Cross-over Center Hooks

    Cross-over center hooks are the second most commonly used hooks. The bent radius for these types of hooks is pronounced. These hooks are made by lifting the last coil and twisting it in the middle.

  • Side Hooks

    Side hooks are ideal to use when body interference is not required during the mechanism. As the name suggests, the hook is on one side of the spring. These hooks are made by bending the last coil and are more economical than other types.

  • Extended Hooks

    These hooks are the same as used in side hooks. These are useful when there needs to be a long length inside the hooks but a shorter body. The extended hooks are the most expensive type of hooks.

  • No Hooks

    Tension springs with no hooks are the most economical ones. These are good to use as they are stress-free, and they have no trace of fatigue at the ends due to the non-presence of the hooks. Springs with no hooks have an increased pulling force and a higher lifespan for the spring.

Types of Tension Springs

Applications of Tension Springs

Tension springs are widely used in our daily life and industries. Some of their applications are:

  • Trampolines
  • Garage doors
  • Toys
  • Pliers
  • Gardening equipment
  • Weapons
  • Carburetors
  • Exercise equipment
  • Fence gates
  • Baby carriages
Applications of Tension Springs

Tension Springs Informational Video


Spring Power Pages

Coil Springs

Coil Springs

A coil spring is an elastic element made of metal or heavy plastic in the form of curls or ringlets of round wire or cord that is wrapped around a cylinder. The winding of a coil spring can be loose or tight in a helical shape depending on the application for which it is made...

Compression Springs

Compression Springs

Coil springs called compression springs can store mechanical energy when they are compressed. These open-coiled, helical springs provide resistance to compressive loading. When these springs are...

Extension Springs

Extension Springs

Extension springs are helical wound springs that are so closely coiled together to create initial tension in the coils. This initial tension creates resistance against the force applied to its ends for extension. The initial tension helps determine how closely and...

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