Torsion Springs


Helical torsion springs are used to apply a torque or store rotational energy. Torsion springs are found in clothespins, window shades, counterbalance mechanisms, ratchets, hinges and various other machine components.


Torsion springs are generally mounted around a shaft or arbor, and must be supported at three or more points. A torsion spring should always be loaded in a direction that causes the body diameter to decrease. The residual forming stresses are favorable in this direction, but unfavorable when the spring is loaded in a direction that increases the body diameter.


The diameter of a torsion spring will constrict or get smaller, it is important to ensure there is enough clearance between the ID of the coil and the shaft that it rides on.

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