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Four Ball Module

Four Ball Testing is designed to test lubricant properties under
various conditions.

How does it work?

The setup is three balls in contact that are fixed but rotates in
relation to the center point. A fourth ball centered on that center
point comes down to make contact and put controlled pressure.

A lubricant to be studied fills the full area and friction is studied.

Extreme Versatility


• ASTM D2266

• ASTM D4172

• ASTM D5183



Properties Analyzed

• Friction Coefficient

• Lubrication Studies

• Friction vs Speed

• Friction vs Load

• Friction vs temperature of liquid,
   Incipient seizure load, Average wear-in scar



Rotating Lower Sample

• (3) 1/2inch (12.7mm) Steel balls. Other ball materials can be used)



Fixed Upper Sample

• (1) 1/2inch (12.7mm) Steel balls. Other ball materials can be used.



Environmental Conditions

• Liquid Heating up to 150 °C

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