Characteristics of tension springs

Many different terminal devices or "hooks" are used to ensure the source of tension for the tension spring. The working principle of a tension spring is opposite to that of a compression spring. Compression springs act in reverse when compressed, while extension springs act in reverse when extended or pulled apart. When both ends of the stretching spring are pulled apart, the spring will attempt to pull them back together. Like compression springs, extension springs also absorb and store energy. But unlike compression springs, most extension springs are usually under a certain degree of tension, even without any load. This initial tension determines the tightness of the tension spring coil without any load.