Which type of bushing cannot be used as self-lubricating?

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The correct answer indicates that sleeved bushings cannot be used as self-lubricating. This is due to the design and materials typically used in sleeved bushings. Sleeved bushings often consist of a metal outer layer and a liner that can vary in material. While they may provide a good fit and alignment, they do not inherently possess self-lubricating properties. Self-lubricating bushings are generally designed to have a material that can retain lubricant or release it gradually to reduce friction, which sleeved bushings lack.

In contrast, other types of bushings, such as metal, plastic, and reinforced fiber composites, can be designed with materials that can maintain lubrication internally or provide a suitable surface to interact with lubricants. These materials and designs help reduce wear and increase the lifespan of the bushing when used in appropriate applications. Hence, understanding the material composition and lubrication characteristics of each type of bushing is crucial when determining their capabilities.

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