Shot Peening

Our Shot Peening in Minneapolis


Shot peening is a cold working process in which spherical media, called shot, is propelled at the surface of a component to impart compressive stresses and increase fatigue life.


How the Process Works:

During our certified shot peening process, each piece of shot that strikes the material acts as a tiny peening hammer, imparting to the surface a small indentation or dimple. To create the dimple, the surface of the material must yield in tension. Below the surface, the material tries to restore its original shape, thereby producing below the dimple, a hemisphere of cold-worked material highly stressed in compression.

Shot Peening Services in MN Are Ideal for the Following Applications:

  • Increase fatigue life for high-stress components, such as automobile and engine parts
  • Increase the lifespan of metal parts through reduction of cracking, stretching, and other stress corrosion
  • Restore parts to adhere to print or engineering specifications
  • Reduction of tensile stresses


The Result:

Nearly all fatigue and stress corrosion failures originate at the surface of a part, but cracks will not initiate or propagate in a compressively stressed zone. Because the overlapping dimples from shot peening create a uniform layer of compressive stress at metal surfaces, controlled shot peening provides considerable increases in part life.


In most cases of long-term failure, the common denominator is tensile stress. Tensile stresses attempt to stretch or pull the surface apart and may eventually lead to crack initiation. Shot peening helps slow crack growth significantly in a compressive layer. Shot peening is the most economical and practical method of ensuring surface residual compressive stresses.


The Benefits:
Compressive stresses are beneficial in increasing resistance to fatigue failures, corrosion fatigue, stress corrosion cracking, hydrogen assisted cracking, fretting, galling and erosion caused by cavitation. The maximum compressive residual stress produced just below the surface of a part, by shot peening is at least as great as one-half the yield strength of the material being shot-peened.

How to Get Started

We have several machines available for controlled shot peening services in Minneapolis, and for other businesses in the Twin Cities and greater Minnesota and Wisconsin area. We offer different sizes of shot for various applications and a certified team of experts to help you determine the best options for your metal parts.
We can provide high-volume shot peening services in Minnesota along with other metal finishing services. Minneapolis, Minnesota, and Wisconsin-area businesses can use our dedicated team as a one-stop-shop for all of their metal finishing needs.

Work with Eaglemaster Inc. on your next deburring or metal finishing job. Get in touch for a quote and free sampling!