Product Description

Extension springs, also called tension springs, are helical mechanical springs designed to operate under tensile load. They are engineered to absorb and store energy when subjected to a pulling force and release that energy as the spring returns to its original length after the load is removed.

These springs typically feature hooks, loops, or other end configurations that allow them to be securely attached to mating components. When force is applied, the coils separate slightly, generating a restoring force that attempts to bring the spring back to its initial state. This property makes extension springs ideal for applications requiring controlled tension and return motion.

Our extension springs are manufactured from high-performance materials such as stainless steel, carbon steel, and music wire. These materials offer excellent tensile strength, elasticity, and fatigue resistance, enabling reliable performance in both dynamic and static load conditions.

Precision spring forming equipment ensures consistent coil geometry, accurate spring rate, and stable load characteristics. Various end styles—including machine hooks, crossover hooks, side loops, and double loops—can be produced to meet specific installation and load requirements. Custom spring dimensions, wire diameters, and surface finishes are also available according to customer drawings or technical specifications.

Extension springs are widely used in mechanical assemblies where tension and return force are required, including automotive systems, industrial machinery, agricultural equipment, garage door mechanisms, fitness equipment, and household appliances.

Product Specifications

Our Advantages

High Quality Materials
Our extension springs are made from premium spring steel materials, ensuring strong elasticity and long fatigue life.

Precision Spring Manufacturing
Advanced CNC spring forming equipment guarantees accurate dimensions and consistent spring performance.

Custom Design Capability
We support OEM and ODM production, allowing extension springs to be customized according to drawings or samples.

Various End Configurations
Multiple hook styles and loop types are available to meet different installation requirements.

Applications

Extension springs are widely used in various industries, including:

• Automotive components

• Industrial machinery

• Agricultural equipment

• Garage door systems

• Fitness equipment

FAQ – Extension Spring

1. What is an extension spring?

An extension spring is a mechanical spring designed to resist a pulling force and return to its original length when the force is removed.

2. What materials are used for extension springs?

Common materials include stainless steel, carbon steel, and music wire for high strength and durability.

3. Can extension springs be customized?

Yes, extension springs can be manufactured according to customer drawings, samples, or specific technical requirements.

4. What are common end types for extension springs?

Common end types include machine hooks, crossover hooks, side hooks, and double loops.

5. What surface finishes are available?

Surface finishes include zinc plating, nickel plating, powder coating, and passivation.

6. What industries use extension springs?

Extension springs are widely used in automotive parts, machinery, agricultural equipment, and household appliances.

7. What wire diameter range is available?

The wire diameter usually ranges from 0.1 mm to 8 mm, depending on the spring design.

8. How do you determine the spring force?

Spring force depends on wire diameter, coil diameter, number of coils, and material type.