Torsion spring is one of the most complicated spring categories

Torsion spring is one of the most complicated design principles among all kinds of springs, and the change of its type is quite lively. Therefore, the theory involved in the design is also the most complicated.


Torsion spring belongs to coil spring. The end of the torsion spring is fixed to other components, and when the other components rotate around the spring center, the spring pulls them back to their original position to produce torque or rotating force. The torsion spring can store and release angular energy or fix a device statically by rotating the force arm around the spring body’s central axis. This type of spring is usually compact, but there is pitch between the coils to reduce friction.


They produce resistance to rotation or external forces of rotation. According to the application requirements, the rotation direction (clockwise or counterclockwise) of the torsion spring is designed to determine the rotation direction of the spring. The coils are either tightly or separately encircled to torsion loads (at right angles to the spring axis). The end of the spring can be wound into a hook or a straight torsion arm.