Bearings • Plain Bearings
Plain bearings are the simplest bearing variety and consist simply of a bearing surface and no rolling elements.
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National manufactures plain bearings, including standard duty, self-lubricating, heavy-duty, extended inner race, and angular contact. Various designs are available in metric and inch sizes with outside diameters from 0 to 9 inches or 0mm to 500mm, and in open or sealed configurations. Plain bearings are used in high load and severe misalignment conditions, and in applications that require oscillation, tilting, or other conditions that involve high rotation speeds.