Leading Extension Spring Manufacturers

Extension springs are helical wound springs that can be stretched for an increase in length. Because of the tension created in them due to extension, these are known as extension springs. Extension springs store mechanical energy and release it in the form of expansion. Each spring end is attached to the components. Read More…

Extension Springs Extension springs are coil springs that lengthen under the weight of a load.

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...

R & L Spring Company $$$

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.

Coiling Technologies, Inc. $$$

CUSTOM "Spring & Wire Form Specialists" - Ace Wire Spring & Form incorporates the latest CNC equipment technology to manufacture compression, extension, torsion springs, complex wire forms, and spring assemblies. We offer consistent quality, lower costs, on-time deliveries, and Design Engineering Assistance. Range from prototypes to long production runs - Women owned & operated since 1939. Let...

Ace Wire Spring & Form Company, Inc. $$$

At Sterling Springs LLC, we specialize in manufacturing a wide variety of high-quality springs for various industries and applications. Our product line includes compression springs, coil springs, torsion springs, extension springs, and industrial springs. We take pride in our capabilities to produce springs in a wide range of sizes and shapes, from tiny springs for delicate medical devices to...

Sterling Spring LLC $$$

We offer years of combined experience and also provide production control, purchasing, and sales. We encourage creativity and empower both employees and customers. Our one-of-a-kind company provides many benefits for all our springs customers.

Anderson Quality Spring Manufacturing, Inc. $$$

An ISO 9002-registered company, Elyria Spring & Specialty is dedicated to giving you high-quality solutions to your spring needs. We manufacture custom compression springs, torsion springs, extension springs and flat springs at competitive prices. Call today for more information!

Elyria Spring & Specialty, LLC $$$

New England Spring was founded in 1866. We originally manufactured products such as pulleys & pillow blocks, which are now featured at the Smithsonian in the Industrial Revolution Exhibit. Currently we are distributing industrial springs. These include coil springs, flat springs, compression springs, metal springs, extension springs & torsion springs. Let us help you find the right spring for you.

New England Spring $$$
Get Your Company Listed
placeholder image R & L Spring Company Coiling Technologies, Inc. Ace Wire Spring & Form Company, Inc. Sterling Spring LLC Anderson Quality Spring Manufacturing, Inc. Elyria Spring & Specialty, LLC New England Spring

These components are pulled apart, and the extension spring tries to pull them back together. Extension springs have a hook at both ends that helps in fastening. There are many types of spring ends, such as open hooks, extended hooks, side hooks, and double full loops.

Extension Springs

Materials Used for Extension Springs

Extension springs are generally cylindrical but can be customized according to one's needs. The most commonly used materials for manufacturing extension springs are:

  • High Carbon Steels

    High carbon steel contains a high amount of carbon and hardens in contact with heat. Other types are music wire, hard-drawn MB, and oil tempered MB.

  • Stainless Steel

    Stainless steel is ideal for manufacturing extension springs because these springs are economical, exhibit good corrosion resistance, and have good magnetic properties. Other types are SS302, SS304, and SS316.

    Stainless Steel
  • Alloy Steel

    Alloy steel is also a type of steel, but nickel, chromium, or molybdenum is alloyed to give hardness and rigidity to the material. Other types are oil tempered chrome vanadium and oil tempered chrome silicon.

  • Copper Alloys

    Copper alloy is well known in the spring industry as they offer excellent corrosion resistance and great electrical conductivity. Other types are phosphor bronze, beryllium copper, brass, Monel 400, and Monel K 500.

    Copper Alloys
  • Nickel Alloy

    Nickel is in high demand because it can be alloyed with any other element and exhibits good heat resistance. These are durable, strong, and can withstand harsh environments. Other types are Inconel 600, Inconel 718, Inconel X 750, Elgiloy, NiSpan C, and Hastelloy.

Manufacturing Process of Extension Springs

The manufacturing process of extension springs is quite simple, but some variations can be seen according to the type of spring being manufactured. The process consists of three steps:

  • Winding

    The first step is the spring winding, in which the spring is fed into the machinery to straighten it up and give it the desired shape. The other steps are:

    • The coiling is done by feeding the wire into a CNC machine to coil it into a spring.
    • The forming process is done by the forming machine, which has six to eight tooling sides that convert the wire into the desired shape.
    • The wire is then transferred into the CNC wire bender for bending.
    Winding Machine
  • Heat Treating

    Heat treatment is the stress-relieving process when the spring is sent to the heated conveyor belt. In the oven, the wire is heated for a maximum time and temperature. The heated spring is then sent to the receiving box for cooling.

    Heat Treating
  • Coating and Finishing

    The last manufacturing step is the coating and finishing of the springs. The spring is coated with different materials to give durability, heat, and corrosion resistance to the spring. The coating is done by shot peening, powder coating, and plating.

Types of Extension Springs

Extension springs are categorized based on end types or hooks attached to them. The hooks or spring ends are designed according to the type of application they are used in. However, customization of hook types is also available. Some of the types are as follows:

Machine and Crossover Center Hooks

  • These are the most common types of extension springs.
  • The machine hooks are directly formed from the spring and then circle across the spring end center.
  • These are stronger than crossover center hooks because of the smaller bending radius.
  • The crossover center hooks are bent across the center, forming a circle on the end.

Side and Extended Hooks

  • These are more economical than crossover hooks and are formed by bending the spring's last coil.
  • This bending offsets the spring and provides tension.
  • Both extended hook and side hook are similar in use, but the difference is that the bending happens with a gap, giving a shorter coil body.

Double-loop and No Hooks

  • The double-loop end has two coils without a gap between the coil and the end of the wire.
  • This prevents spring breakage and gives more strength to the spring.
  • The spring with no hooks has no stress and fatigue on its ends.
  • It is more economical, has a better life cycle, and has a good pulling force.
Types of Extension Springs

Applications of Extension Springs

Extension springs are widely used in our daily life. There are a variety of functions that these springs offer. Extension springs are used in automotives, medical equipment, washing machines, pliers, toys, garage doors, trampolines, farming equipment, baby carriages, fence gates, and many more products.

Choosing the Proper Extension Spring Supplier

To make sure you have the most beneficial outcome when purchasing extension springs from an extension spring supplier, it is important to compare at least 5 companies using our list of extension spring suppliers. Each extension spring supplier has a business profile page that highlights their areas of experience and capabilities and a contact form to directly communicate with the supplier for more information or request a quote, Review each extension spring company website using our patented website previewer to get an idea of what each extension spring business specializes in, and then use our simple RFQ form to contact multiple extension spring companies with the same quote.

Extension 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...

Metal Springs

Metal Springs

Springs are a flexible machine element that store mechanical energy when subjected to tensile, compressive, bending, or torsional forces. When the spring is deflected, it stores energy and at the same time exerts an opposing force...

Torsion Springs

Torsion Springs

A torsion spring is a mechanical device that stores and releases rotational energy. Each end of the torsion spring is connected to a mechanical component. As the spring is rotated around its axis on one end, the winding of the spring is tightened and stores potential energy...

Wire Forming

Wire Forming

Wire forming is a method for applying force to change the contour of wire by bending, swaging, piercing, chamfering, shearing, or other techniques. The various techniques for wire forming can produce any type of shape, form, or configuration...

Contract Manufacturing

Contract Manufacturing Animation

Contract manufacturing is a business model where a company hires a manufacturer to produce its products or components. It is an outsourcing method for producing products by taking advantage of the resources and expertise of an...

Metal Mesh

Metal Mesh

The phrase "wire mesh" describes two- or three-dimensional structures constructed of two or more metallic wires connected by various techniques. In a wide range of settings, wire mesh products are...

Wire Racks

Wire Racks

A wire rack is a level wire form utilized to stock and exhibit a number of products, usually retail. The bottom surface on which such goods are stored is made of several latticed or interlaced metal strands...

Metal Forming Services

Featured Industries