Bushing bearings, also known as plain bearings, bushings, or sleeve bearings
, are thin tube-like structures used to decrease friction between two surfaces. Unlike rolling-element bearings
, they are designed as a single part. They can be made of a variety of materials, which impacts bushing performance and lubrication requirements. Composite bushings include combinations of bronze, steel, and thermoplastics; these bushings are self-lubricating, and offer both low friction and strength. Bi-metallic bushings
consist of a bi-metallic shell, giving them a high load capacity and reliability. Bronze wrapped bushings often consist of lubricant indents or holes for grease or oil, allowing a lubricant film to build up rapidly and reduce friction. Metallic bushings contain high strength metal backing and strong lubricants, providing high load carrying capacity, self-lubricating properties, accuracy, and high performance under strenuous operating conditions. Filament wound plastic bushings are also self-lubricating, and feature a combination of glass fibers and epoxy resin, providing extremely high load capacity resistant to corrosive environments. Injection molded plastic bushings are made of a variety of plastics, and are self-lubricating to provide excellent wear resistance in a multitude of operating conditions. Bushing bearings are used in a wide variety of applications, including drill jigs, vehicles, and hydraulic external gear pumps and motors. MRO Supply carries a formidable selection of bushings featuring various manufacturers, materials, and sizes, to suit any application.