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price of steel ball used in four ball test

The 4Ball Extreme Pressure EP test is performed by placing three 189inch diameter steel balls in a test cup filled with the test grease. A fourth ball is placed in the instrument chuck and brought into contact with the three lower balls.

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    The 4Ball Extreme Pressure EP test is performed by placing three 189inch diameter steel balls in a test cup filled with the test grease. A fourth ball is placed in the instrument chuck and brought into contact with the three lower balls.

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