A conical spring is a type of compression coil spring wound in a conical shape. Its most significant feature is that as a load is applied, the coils overlap, allowing the solid height to be kept extremely low. This makes it ideal for use in limited spaces or in designs where compactness is desired while ensuring sufficient stroke. Furthermore, its load-deflection characteristic is often progressive (non-linear), meaning it is soft initially and becomes stiffer as the load increases. This property allows it to exhibit excellent performance in shock absorption and vibration damping. Its main applications include automotive parts (clutches, suspension aids), home appliances, industrial machinery, and medical devices, where space-saving and specific load characteristics are required. Manufacturing involves forming spring steel wire into a conical shape using a coiling machine, followed by heat treatment, shot peening, and surface treatment as needed. In design, careful consideration of coil interference during solid compression and buckling stability is crucial.