The component that separates the rollers in an anti-friction bearing and allows them to turn freely is the:

• A. Spacer
• B. Cage
• C. Retainer
• D. Seal

Answer: (B)

Rolling elements have to stay apart so they can roll freely and share the load without rubbing against one another. The part that does this is the cage, also called the retainer. It spaces the rollers at uniform intervals and keeps them aligned between the inner and outer races. By holding the rollers apart, the cage prevents direct contact between adjacent rollers, reduces friction, and helps distribute lubrication as the bearing turns. A spacer just sets distance between parts but doesn’t actively guide the rollers during rotation. A seal’s job is to keep lubricant in and contaminants out, not to separate the rolling elements. The retainer terminology describes the same function in many bearings, but the essential idea is that this component maintains proper spacing and guides the rollers.