Some of the more common end configurations available are shown below. Special configurations are available on request. In designing ends, it is important to recall that bends, loaded to decrease their radius of curvature, have favorable residual stresses. They can operate at higher applied stress levels than bends that increase the radius by loading. Frequently, spring performance is limited because the sharply bent ends have greater stress than the body.

Special types of torsion springs include double torsion springs and springs having a space between the coils to minimize friction. Double torsion springs consist of one set of coils coiled right hand and one set of coils coiled left hand. These coils are connected, usually with an unwound section between the winds and work in parallel. The sections are designed separately with the total torque being sum of the two.

The direction of wind of a spring can be determined by simply holding it in your hand with your fingers placed around the outside of the body and your thumb pointing straight up. If the last coil ends in the same direction that your fingers are pointing, that is the hand (direction of wind) of the spring. The Wind of the torsion spring can be right hand, left hand, or double torsion.Good design dictates that torsion springs should be used in the direction that winds the coil. (Note: Lee Spring Stock Torsion Springs are offered with legs of equal length oriented at varying unloaded angles.)

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