Power spring is the steel strip wound on an arbor and confined in a spring case. When a force rotates the spring, arbor will have relative motion with spring case and store rotational energy in the form of torque. When the force is removed, torque releases through the central arbor or the spring case in which it is restrained. The product range from 0.03~0.75mm in thickness and 1~50mm in width.

Constant torque spring is made by winding steel strip into coil. When springs are counter wound on to output drum from its natural type by a load, force to resist uncoiling will be occurred. However, if load disappears, a constant torque will be output from output drum at the same time. Therefore, it is called constant torque spring. Comparing it with traditional power spring, its advantages are following?To exert nearly constant torque during entire stroke. It has better performance than power spring in more revolution designs. All revolutions are almost useful revolutions. It’s high efficiency. The product range from 0.03~0.75mm in thickness and 1~50mm in width.