At Satte in order to product the highest quality springs, there are numerous steps from the raw material to a finished product. Our equipment, experience and professional personnel, enables us to produce springs economically, rapidly maintain exceptional quality.

Step one: Fabricate the springs


Step two: Low temperature annealing

Annealing softens the metal by re-crystallization. The material returns to a softened state allowing further cold working, if required.

Heat treating springs at the appropriate temperature removes the stress induced by the “cold working” of the metal Increasing resistance to fatigue and amplifying strength.

Step three: Grinding

Grinding is used to make one or two flat ends on helical compression springs. Grinding to make the ends flat reduces the risk that the spring could buckle.


Step four: Shot Peening

Shot peening is carried out on spring wire that has not been surface treated. It is a post-treatment of an already coiled spring. Steel shot is flung at great force at the surface of the compression spring causing microscopic cracks in the surface created by winding to be "welded" together, reducing the likelihood of fractures due to the formation of cracks. This ensures the compression spring a longer service life increasing fatigue strength.   Shot peening is normally used on compression springs with a wire thickness of 1.5 mm and above.


Step five: Low temperature annealing

The springs are annealed again to remove the stress created by shot peening.


Step six: Hot setting

Hot setting is a process employed to improve the long-term load stability of compression springs when it is anticipated that they will be exposed to elevated temperatures. Also, if load stability is critically important, it is carried out on highly stressed springs that will operate at ambient temperatures but for extremely long periods of time.

Step seven: Final inspection

Final inspection ensures that the springs conforms to our client窶冱 specifications. Our quality control procedures measure all aspects of those requirements including equalization, quantity of down and spring stability as well as other parameters.


Step eight: Packaging

We can supply product packaging conforming to the requirements of our clients.