Spherical plain bearings feature sphered sliding surfaces on both inner and outer rings, designed to transmit radial, axial, and combined loads, including shock loads. They accommodate various movements such as vibrating, rocking, and rotating motions at low speeds in machine joints and mechanisms. Radial, angular contact, and thrust spherical bearings are available to suit different load types.

These bearings are categorized based on lubrication method: some require external lubrication, while others are self-lubricating with special materials on sliding surfaces. Self-lubricating bearings are preferred for applications requiring durability or where maintenance is challenging.

Bearings with protective contact seals are also available to shield sliding surfaces from environmental factors and retain lubricants.

Selecting the appropriate type of spherical plain bearing involves considering various factors and balancing conflicting requirements to achieve optimal performance.