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A self-aligning ball bearing has a basic dynamic load rating (C10, for 10⁶ revolutions) of 35 kN. If the equivalent radial load on the bearing is 45 kN, the expected life (in 10⁶ revolutions) is

1. below 0.5
2. 0.5 to 0.8
3. 0.8 to 1.0
4. above 1.0

Correct answer: below 0.5

Solution

The expected life of a bearing is inversely proportional to the load it experiences compared to its load rating. Since the equivalent radial load of 45 kN exceeds the basic dynamic load rating of 35 kN, the bearing will have a significantly reduced lifespan, likely falling below 0.5 million revolutions.

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