Plain bearings, also known as journal bearings, support a rotating shaft using a simple sliding surface rather than rolling elements like balls or rollers. 3BG Supply Co. stocks plain bearings and spherical plain bearings designed to handle oscillation, misalignment, and low-speed rotation in a wide range of industrial machinery. Because spherical plain bearings are also used inside rod ends, our team can help you find compatible parts whether you need a standalone journal bearing or a complete rod end assembly. Explore our full bearings catalog or contact us for help matching a plain bearing to your application.
These bearings handle oscillation and misalignment at low speeds. They are related in that rod ends always incorporate spherical plain bearings. Spherical plain bearings are sometimes called plain/plane bearings. Rod ends and spherical plain bearings can often be found in textile factories and automotive steering assemblies.
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FAQs
What is a journal bearing?
A journal bearing, also called a plain bearing, is a simple bearing design in which a rotating shaft (the journal) turns against a smooth inner surface, typically lubricated to reduce friction. Unlike ball or roller bearings, plain bearings have no rolling elements.
How does a plain bearing work?
A plain bearing works by allowing a shaft to slide or rotate against a bearing surface, often with a thin film of lubricant separating the two surfaces to minimize direct metal-to-metal contact. This sliding action reduces friction and wear compared to unlubricated contact.
What are plain bearings made of?
Plain bearings are commonly made from bronze, steel, or composite materials with low-friction coatings or liners, such as PTFE. The specific material depends on the load, speed, and environmental conditions the bearing will face.
What are plain bearings used for?
Plain bearings are used in applications involving oscillation, misalignment, or low-speed rotation, including machine linkages, pivot points, and rod end assemblies. They are valued for their simplicity, compact size, and ability to handle heavy loads in a small footprint.
What is the difference between a journal bearing and a ball bearing?
A journal (plain) bearing relies on a sliding contact surface, while a ball bearing uses rolling balls to support the load. Ball bearings generally offer lower friction at higher speeds, while plain bearings can handle heavier loads in a more compact, simpler design.
Industrial Plain Bearing Manufacturers
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