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China Extension Springs – Leading Suppliers & Factory for High-Quality Coil Springs
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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 – Leading Suppliers & Factory for High-Quality Coil Springs

Extension springs are essential components in various applications, designed to absorb and store energy while resisting pulling forces. These springs are typically fixed at both ends to other parts, and as these parts move apart, the extension spring works to pull them back together. The initial tension of an extension spring determines how tightly it is coiled and can be adjusted to meet specific load requirements for different applications. Our extension springs are manufactured in China by experienced suppliers and feature hooks, eyes, or other interface geometries for easy attachment to other components. Commonly utilized to provide a return force to components that extend in the actuated position, our products from the factory ensure reliability and optimal performance in your mechanical systems.

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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 are the different configuration styles available for extension springs?
    Extension spring ends can be configured in many forms, including threaded inserts, extended twist loops, crossover center loops, hooks, expanded eyes, reduced eyes, rectangular ends, and teardrop-shaped ends. All of these can be produced to vary in distance from the spring body, giving engineers flexibility in custom designs.
    Q What is the difference between Free Length and Extended Length in extension springs?
    The Free Length is the overall length of the spring in its unloaded, natural state, measured from the inside of the end loops. The Extended Length refers to the total length of the spring when it is fully stretched to its maximum rated extension under 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 passing through the spring's center and hooked around the opposite end, compressing the spring upon loading. Drawbar springs are ideal for potential overload situations because they feature a built-in definite stop, continuing to carry a static load even after reaching their maximum extended length. A common example is their use in supporting porch swings.
    Q What are the main applications for extension springs?
    Extension springs are used in 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. They are also used in medical devices and heavy off-road machinery brake springs, covering a wide spectrum of sizes and load requirements.
    Q What does Spring Rate mean and how is it measured?
    The Spring Rate is the amount of force required to extend or compress a spring by a unit of length. It is typically expressed as pounds per inch (lbs/in) in Imperial units or Newtons per millimeter (N/mm) in Metric units. A higher spring rate means the spring is stiffer and requires more force to stretch the same distance.
    Q Are SMS Spring extension springs available in both Inch and Metric sizes?
    Yes, SMS Spring extension springs are available in both Inch (Imperial) and Metric designs. Metric Extension Springs can also be specified to comply with DIN Standards. When selecting a spring, it is important to choose the correct unit of measure to ensure the spring meets your application's exact requirements. Custom extension springs can also be manufactured to specification if standard sizes do not meet your needs.