This is a simple question that is worth repeating. Sleeve bearings are the most common type of plane bearing, and are suitable for use in a range of applications. Sleeve bearings are designed to carry linear, oscillating or rotating shafts, and function via a sliding action. Plain and sleeve bearings are often compact and lightweight, and generally offer good value. To compare various bearing configurations, see our recent post on common bearing types. Where are sleeve bearings found?