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High-Quality Extension Springs from China Factory - Trusted Suppliers for Your Energy Absorption Needs
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Cam type spring forming machine

Cam type spring forming machine
10 Axes CNC Camless Spring forming Machine (Without wire rotation) (Wire Range:0.2-2.5mm)

10 Axes CNC Camless Spring forming Machine (Without wire rotation) (Wire Range:0.2-2.5mm)
CNC Camless Spring Machine (Wire Range:0.2-2.5mm)

CNC Camless Spring Machine (Wire Range:0.2-2.5mm)
CNC Camless Coiling Spring Machine (Wire Range:1.2-4.5mm)

CNC Camless Coiling Spring Machine (Wire Range:1.2-4.5mm)
Pressing wire forming machine

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SMS -3D-8100/8120 (Flat Type) Wire Forming Machine
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6axis High Speed Spring Coiling Machine
2axis High Speed Sping Coiling Machine

2axis High Speed Sping Coiling Machine
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Extension Springs – most common & widely used springs1.jpg
Extension Springs – most common & widely used springs1.jpg

High-Quality Extension Springs from China Factory - Trusted Suppliers for Your Energy Absorption Needs

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Extension springs are vital components that absorb and store energy while offering resistance to pulling forces. These springs are typically attached at both ends to various parts, and as these parts move apart, the extension spring works to pull them back together. The initial tension of an extension spring is crucial, as it determines the coil tightness, which can be adjusted to meet specific load requirements for various applications. Featuring hooks, eyes, or other attachment geometries at each end, extension springs are easy to connect to the components they serve. Often utilized in systems requiring a return force when the components extend, these springs are essential in many industries. Our factory in China specializes in producing high-quality extension springs, making us a leading supplier for businesses looking for reliable and effective spring solutions.

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    Product Details

    Configurations
    Configuration Specifications

    SMS Spring's Extension Springs are supplied with full diameter loops (either machine or crossover center) at a random position with the exception of Metric Extension Springs specified to comply with DIN Standards. Loop openings are approximately one wire diameter and the direction of wind is factory optional. Lee Stock Extension Springs are available in both Inch and Metric designs. If exact direction of helix is required, Custom Extension Springs can be made to specification. To fit assembly functions, a multitude of hook or loop configurations may be specified. Close winding of the body provides initial tension in the spring to help manipulate the load and rate.

    Configuration Style

    Extension spring ends include threaded inserts, extended twist loops, crossover center loops, hooks, expanded eyes, reduced eyes, rectangular ends and teardrop-shaped ends, which can all be produced to vary in distance from the spring body. At the design stage of custom extension springs, the length of the hooks at each end of the spring can be adjusted in order to precisely obtain the required spring load at any extended position.

    Configuration Function

    Continuous Length Extension Springs are designed to be cut to desired length by the user to meet a particular load requirement. Various loops or hooks can be formed on the ends using looping pliers or other appropriate instruments; as wire size increases, use different tools including a vise to hold the coil body and a pry bar to bend up the last coil.

    Configuration Usage

    Another common type of extension spring is the drawbar spring. In a drawbar, the load is applied at the ends of long steel loops which pass through the spring's center and are hooked around the opposite end, thus compressing the spring upon loading. Drawbar springs are excellent for use in potential overload situations and offer a built-in definite stop that will continue to carry a static load after reaching the maximum extended length. A common application of the drawbar spring is to support a porch swing.

    Application
    🔧 Applications for extension springs include automotive interiors and exteriors, garage door assemblies, vise-grip pliers, carburetors, trampolines, washing devices, farm machinery, toys as well as thousands of other uses. Extension springs come in a wide array of sizes, from small medical devices to off-road machinery brake springs.
    Extension Springs – most common & widely used springs
    Key Design Parameters
    Outside Diameter, Inside Diameter, Wire Diameter, Free Length and Extended Length
    The Free Length is the length of a spring in the unloaded position (measured from inside the end loops).
    The Extended Length is the length at full rated extension.
    Spring Rate and Maximum Load
    The Spring Rate is the force per unit spring deflection, such as lbs per inch travel.
    The Maximum Load is the load at full rated extension.
    SMS Spring's Springs are specified in both Imperial (inch and pound) and Metric units.
    Be sure to select the preferred unit of measure when looking for using SMS Spring.
    Frequently Asked Questions
    Q What types of end configurations are available for extension springs?
    Extension spring ends are available in many configurations including threaded inserts, extended twist loops, crossover center loops, hooks, expanded eyes, reduced eyes, rectangular ends, and teardrop-shaped ends. These can all be produced to vary in distance from the spring body to meet specific assembly requirements.
    Q What is the difference between Free Length and Extended Length in extension springs?
    The Free Length is the overall length of the spring when it is in its unloaded, natural state — measured from inside the end loops. The Extended Length, on the other hand, refers to the total length of the spring when it has been stretched to its full rated extension under maximum load.
    Q What is a drawbar spring and what are its advantages?
    A drawbar spring is a type of extension spring where the load is applied at the ends of long steel loops that pass through the spring's center. This design compresses the spring upon loading and provides a built-in definite stop, making drawbar springs ideal for potential overload situations. They can continue to carry a static load after reaching maximum extended length — a common use case is supporting a porch swing.
    Q What common applications use extension springs?
    Extension springs are used in a wide range of applications including automotive interiors and exteriors, garage door assemblies, vise-grip pliers, carburetors, trampolines, washing devices, farm machinery, and toys. Their sizes range from small components used in medical devices to large brake springs found in off-road machinery.
    Q Are SMS Spring extension springs available in both inch and metric sizes?
    Yes. SMS Spring's extension springs are available in both Inch and Metric designs. Springs are specified using both Imperial (inch and pound) and Metric units. Metric Extension Springs can also be specified to comply with DIN Standards. When searching for a spring, be sure to select your preferred unit of measure.
    Q Can I customize the hook length and helix direction of an extension spring?
    Yes. For custom extension springs, the length of the hooks at each end can be precisely adjusted to achieve the required spring load at any extended position. If an exact direction of helix is required, custom extension springs can be manufactured to specification, as the standard direction of wind is factory optional.