Which description matches an anchor bearing?

• A. A rolling-element bearing using balls or rollers.
• B. A plain bearing with no rolling elements.
• C. A thrust ball bearing.
• D. A brass bushing that sits in the middle of a shaft.

Answer: (D)

Anchor bearings are a type of plain, sleeve bearing that provides a sliding contact surface around a shaft to hold and support the rotating part. They’re typically made as a brass (bronze) bushing that fits around the shaft and sits inside a housing, effectively anchoring the shaft and providing low-friction rotation without any rolling elements. That’s why the description of a brass bushing sitting in the middle of a shaft best matches an anchor bearing: it describes a sleeve-style bearing around the shaft rather than a rolling-element arrangement or a thrust-specific design. The other options describe rolling-element bearings or simple plain bearings without emphasizing the around-the-shaft bushing arrangement.