A compression spring is a mechanical component designed to resist compressive forces. When the spring is compressed, it stores energy in the material, and once the pressure is released, it returns to its original shape. Compression springs are used to provide resistance or to return parts to their original position in various mechanical and technical systems.

Compression springs are available in a wide range of sizes, varying in wire diameter, outer diameter, free length, and maximum compression. The appropriate dimensions depend on the force the spring needs to withstand, how far it needs to compress, and how much space is available in the application. Selection is typically based on technical specifications or standardized size charts.

The applications for compression springs are extensive. They are found in everything from valves and couplings to locking mechanisms, vehicles, tools, electronics, and industrial automation systems. In all cases, the spring delivers controlled movement or restoring force where precision and durability are required.