Extension springs are essential mechanical components that serve a dual purpose: they effectively absorb and store energy while simultaneously creating resistance against pulling forces. These versatile springs are strategically attached at both ends to different components, and when these connected parts move away from each other, the spring's inherent properties work to pull them back together. The spring's behavior is fundamentally governed by its initial tension, which determines how tightly the coils are wound together. This initial tension can be precisely engineered and adjusted to meet specific load requirements for various applications.

Extension springs are characterized by their unique construction, utilizing round wire to create a close-wound design that incorporates initial tension. Their design typically features specialized end configurations such as hooks, eyes, or other interface geometry that facilitate secure attachment to opposing components. These springs excel in applications where a return force is needed for components that extend or stretch from their original position, making them invaluable in numerous mechanical systems.

The versatility of extension springs is demonstrated through their widespread use across diverse industries and applications. They are integral components in automotive systems, both in interior and exterior applications. These springs play crucial roles in everyday items like garage door assemblies, vise-grips, and carburetors. They are also essential in recreational equipment such as trampolines and complex farm machinery. The adaptability of extension springs extends to the toy industry and countless other applications.

Their availability spans an impressive range of sizes and configurations across thousands of applications.