AST Suspension can also supply you springs with your own suggested spring rates. These springs are made of Chrome – Silicon material, after winding these springs the material get's heated to relax the metal. They heat the springs from 300 to 460 degrees this depends of the material thickness.
After this process the springs get sandblasted with little bullets, so called shot peening.The advantage of shot peening is that the coating will stick better on the surface.
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