Bushings (also known as self-lubricating bearings, dry bearings, or oilless bearings) are plain bearings that utilize the inherent self-lubricating properties of their materials to reduce friction. This article consolidates the fundamental definitions, the three-layer structural principles, four structural forms, and common material classifications (such as DU/DX composites) of bushings. It objectively compares the differences between bushings and ball bearings, and provides five key selection criteria—including load capacity and PV value—serving as a practical reference for engineering designers and procurement professionals.
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