plain shaft bearing
Plain shaft bearing (in railroading sometimes called a solid bearing) is the simplest type of bearing,
comprising just a bearing surface and no rolling elements. Therefore the journal
i.e., the part of the shaft in contact with the bearing slides over the bearing surface.
The simplest example of a plain bearing is a shaft rotating in a hole.
A simple linear bearing can be a pair of flat surfaces designed to allow motion;
e.g., a drawer and the slides it rests on or the ways on the bed of a lathe.
Plain bearings, in general, are the least expensive type of bearing.
They are also compact and lightweight, and they have a high load-carrying capacity.