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max federn springs are a special type of extension spring, suitable for applications with large elongation and constant load. Constant-force springs consist of spirally wound metal strips; the inner side of the strip is curved so that each turn wraps tightly around the preceding one. When the metal strip is extended (twisted), internal stress resists the load force, similar to ordinary extension springs, but the spring rate remains nearly constant (zero). See the load/torsion diagram. In use, an ID is typically used to wind this spring tightly onto a drum, with its free end connected to the load.