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China Extension Springs Factory – Leading Suppliers of High-Quality Extension Springs for Various Applications
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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

Pressing wire forming machine
SMS -3D-8100/8120 (Flat Type) Wire Forming Machine

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

6axis High Speed Spring Coiling Machine
2axis High Speed Sping Coiling Machine

2axis High Speed Sping Coiling Machine
Oil Sealing Spring Jointing Machine

Oil Sealing Spring Jointing Machine
SMS - HS-SM Fully Automatic High-Speed Sofa Spring(Snake Spring or Zig Zag Spring) Forming Production Line

SMS - HS-SM Fully Automatic High-Speed Sofa Spring(Snake Spring or Zig Zag Spring) Forming Production Line
Extension Springs – most common & widely used springs1.jpg
Extension Springs – most common & widely used springs1.jpg

China Extension Springs Factory – Leading Suppliers of High-Quality Extension Springs for Various Applications

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Extension springs are essential components that absorb and store energy while providing resistance to pulling forces. Manufactured by reliable suppliers in China, these springs are engineered to connect to other components at both ends. As the connected components move apart, the extension spring works to pull them back together, ensuring a consistent return force. The initial tension of the spring is crucial, as it determines how tightly the coil is wound, allowing for customization to meet specific load requirements in various applications. Our factory specializes in producing high-quality extension springs with hooks, eyes, or other interface geometries for seamless attachment to your mechanical systems. Trust us for your extension spring needs and benefit from our expertise in delivering reliable products from China.

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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 springs1
    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 a wide variety of configurations, including threaded inserts, extended twist loops, crossover center loops, hooks, expanded eyes, reduced eyes, rectangular ends, and teardrop-shaped ends. Each end type can be produced to vary in distance from the spring body to accommodate different assembly requirements.
    Q What is the difference between Free Length and Extended Length in an extension spring?
    The Free Length is the length of the spring when it is in an unloaded position, measured from inside the end loops. The Extended Length refers to the total length of the spring when it is at its full rated extension under maximum load.
    Q How is the Spring Rate defined, and why does it matter?
    The Spring Rate is the measure of force required per unit of spring deflection — for example, pounds per inch of travel. It is a critical design parameter because it determines how much resistance the spring provides as it is extended, ensuring the spring delivers the correct load at any given position within its operating range.
    Q What is a drawbar spring and when is it used?
    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 and hook around the opposite end, compressing the spring upon loading. Drawbar springs are ideal for potential overload situations as they provide a built-in definite stop and can continue to carry a static load after reaching maximum extended length. A common example is supporting a porch swing.
    Q What are the most common applications for extension springs?
    Extension springs are used across a vast range of industries and products, including automotive interiors and exteriors, garage door assemblies, vise-grip pliers, carburetors, trampolines, washing devices, farm machinery, and toys, among thousands of other uses. Their sizes range from small components in medical devices to large brake springs used in off-road machinery.
    Q Are SMS Spring extension springs available in both Inch and Metric units?
    Yes. SMS Spring's extension springs are specified and available in both Imperial (inch and pound) and Metric units. Stock extension springs are offered in both Inch and Metric designs, and custom extension springs can be manufactured to comply with specific standards such as DIN Standards for Metric designs. Users should select their preferred unit of measure when searching for the appropriate spring.