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What is shot peening?

  • Shot peening is the cold working and polishing of the spring surface by bombardment with spherical shot or glass beads
  • The polishing retards possible crack formation
  • Shot peening increases durability by approximately 30%
  • For stainless spring steels, glass beads are used; for other spring steels, rounded wire shot from 0.6 mm to 0.9 mm is used, depending upon the diameter of the spring wire