There are generally four types of springs. Spring types produced by spring factories are usually divided into:

Pressure compression spring (spring) is under the pressure of the spiral spring, it is used in the data section for more rounded, useful also rectangle and multi-strand steel rolled a travelling, spring is usually pitch, such as the shape of the compression spring are: cylindrical, conical, convex and concave and a small amount of noncircular, compression spring there is a certain gap between circle and circle, when under external load spring contraction deformation, deformation energy storage.

Tension spring (tension spring) is to bear the axial tension of the helical spring, tension spring is generally made of circular section material. When the load is not borne, the tension between the spring ring and ring are generally tight and no gap.

Torsion spring (torsional spring) USES the lever principle, through the material is soft, the flexibility of the larger elastic material distortion or rotation, so that it has great mechanical energy. It is a spring that is subjected to torsional deformation, and its working part is also that the rings are either tightly or separately surrounded. These are different kinds of springs produced by the spring factory.

The difference between a special-shaped spring and a regular spring is that the spring itself is irregular, with bending and a lot of complex angular design. Suitable for some special occasions.