Which of the following is not a basic bearing element?

• A. Inner race
• B. Outer race
• C. Cage
• D. Lubricant

Answer: (D)

The main concept here is what counts as the basic parts that make up a bearing. A bearing’s solid, load-carrying components are the inner race, the outer race, and the cage that spaces the rolling elements (balls or rollers). These form the structural elements that support load and allow rotation. Lubricant, while essential for reducing friction, cooling, and wear, is a fluid applied to the bearing rather than a structural component. It isn’t a basic bearing element, so it’s the one that doesn’t fit with the core parts.