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Tapered Coil Spring have tapered coil diameters that provide variable spring rates. This means that as the Coil Wire Springs is compressed, resistance increases, making them ideal for applications requiring progressive or variable force, such as valves, electrical switches, and automotive clutches.

Extension springs are important components in various mechanical systems, providing the force needed to extend and retract parts. They come in a variety of types and designs, including Extension springs with loop ends, extension springs with hook ends, and custom extension springs. These springs are designed to absorb and store energy, releasing it when the spring is extended or pulled.