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Abstract
A bearing is interposed between two surfaces in relative motion to minimize the wear by one surface of the other and/or to reduce the friction between them. A plain bearing is made of, or is lined with, a material that achieves this object under conditions of sliding contact between it and one or other (or both) of the surfaces. This review is concerned with the materials of such sliding contact bearings only and does not cover the steel of rolling element bearings, which have their own peculiar property requirements.