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Coil springs are cylindrical devices made from coiled wire, designed to either store and release energy or maintain a load's position. Their unique design allows them to compress or extend under pressure, returning to their original shape when the force is removed. This capacity makes them indispensable in applications where shock absorption, weight distribution, and flexibility are crucial.

In a machined torsion spring, a pure couple can provide the moment. A pure couple can come from double tangs (external, internal and longitudinal), slots, splines (internal and external) and bolt circle configurations. One can also resolve the moment by an integral torque restraint on the coil side.