Coil Springs are more common as they are the most used in mechanics.
As a rule, they are made of steel wire wound in a cylindrical or conical gel form. The shape of the steel wire can be rectangular, circular, square, etc.
Coil springs can work by compression, traction or torsion.
Compression springs
Compression helical springs are meant to accumulate forces during their compression and apply them in a “pushing” motion. They are built in a parallel helical or conical shape.
They are generally produced with cylindrical wires, and in specific cases, when it is necessary to apply greater forces in reduced spaces, using square, rectangular or otherwise- shaped wires.
Torsion springs
The torsion helical springs are created to receive torsion requests on their extremities. In other words, they have rods that can be straight or curved where the force is applied.
They’re generally designed to work around an axis, and when they are subjected to lateral forces, applied on the rods, they tend to roll their coils further.
They are normally produced with cylindrical, square or rectangular wires, or of any other special shape.
Traction springs
Traction helical springs are similar to compression helical springs. However, they need special extremities for the load to be applied.
These extremities are called hooks and can have several shapes.
When they are subjected to the action of a “pushing” force, the space between the coils increases, thus increasing its length.