Shot Peening Process Description

What does it do? How can I use it? Why will it help me?

Shot peening machines bombard a part with tiny beads that each act like ball-peen hammers, creating dents in the surface of the part that relieve tensile stress, strengthen the part against wear, and improve surface finish. It can perform a similar function to sandblasting (in that it cleans and finishes a part quickly) or to some forms of heat treating (in that it strengthens a part against repeated wear or fracture).

Cracks in a component occur in areas where there is a high amount of tensile residual stress. By compressing these areas with the shot peening media, the tensile stress is converted to compressive stress, which strengthens the part rather than weakens it. This process is used extensively in the production of all types of springs, which are especially vulnerable to fractures from repetitive wear.

Shot peening is incredibly effective in increasing component life. It can increase gear life by more than 500%, and spring life by up to 1200%.

For answers to your questions or more information on shot peening call Liberty at 847-276-2761 or send us an email at

Liberty Machinery is your trusted source for shot peening equipment.

We buy and sell all types of finishing machines.

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Process Description: How does it work?

Shot peening is subject to a wide variety of methods and processes, but they all contain the same basic elements: the media, the chamber, the recovery system, and the propellant system.

The media are the small objects that create the dents in the surface of the component. They come in various sizes and can be made of glass, ceramic, or iron, but are most commonly made of cut wire which does not shatter into jagged fragments.

This media is shot out by the propellant system using any of a range of methods, such as air compression or centrifugal force, and the stream of propelled media is directed onto the component being peened while enclosed in the chamber for safety.

The media are then recovered and are often able to be used again.

While this process is very straightforward it can be supplemented by many different pieces of equipment in order to increase efficiency, speed, and cost effectiveness.

Common Industries

Aerospace     Automotive     Springs     Gears

Common Processes:
  • Crankshafts
  • Camshafts
  • Landing gears
  • Ring and pinion gears
  • Spur gears
  • Compressor disks
  • Turbine disks
  • Compressor airfoil and roots
  • Aircraft wheels
  • Aircraft wing skins
  • Connecting rods
  • Coil springs
  • Leaf springs

Major Shot Peening Manufacturers

Engineered Abrasives, Pangborn, Wheelabrator

Sell Your Shot Peening Equipment

Liberty is always looking for used shot peening and finishing equipment to buy for inventory. Contact us and let us know what you have for sale. We’ll be happy to give you a free quote.

Check our Inventory for Used Shot Peening Equipment

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Visit Liberty’s YouTube channel for machine videos

  1. Jason Johnson, Albert Whetstone, Juston Johnson. “Shot Peening.”
  2. Shot Peening Process