Plain bearings,Bushings

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A plain bearing, or more commonly sliding bearing and slide bearing (in railroading sometimes called a solid bearing, journal bearing, or friction bearing[citation needed]), 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.

Integral plain bearings are built into the object of use as a hole prepared in the bearing surface. Industrial integral bearings are usually made from cast iron or babbitt and a hardened steel shaft is used in the bearing.

Integral bearings are not as common because bushings are easier to accommodate and can be replaced if necessary.Depending on the material, an integral bearing may be less expensive but it cannot be replaced. If an integral bearing wears out, the item may be replaced or reworked to accept a bushing. Integral bearings were very common in 19th-century machinery, but became progressively less common as interchangeable manufacture became popular.

For example, a common integral plain bearing is the hinge, which is both a thrust bearing and a journal bearing.

Bearing Number	Bore Dia	Outer DIa	Width	Size
16 mm x 20 mm x 25 mm skf PSM 162025 A51 Plain bearings,Bushings	1 Piece Solid	4 Bolt Pillow Block	0883450216517	3.75 Inch \| 95.25 Mi
11,113 mm x 13,494 mm x 12,7 mm skf PCZ 0708 M Plain bearings,Bushings	6.0	Bearings	0	N/A
16 mm x 18 mm x 20 mm skf PCM 161820 E Plain bearings,Bushings	Flange Block Bearing	2 Bolt Flange Block;	INS-SC-45M	1.772 Inch \| 45 Mill
50 mm x 60 mm x 50 mm skf PBM 506050 M1G1 Plain bearings,Bushings	ASAHI BEARINGS	Mounted Units &	0808250129478	N/A
22 mm x 25 mm x 20 mm skf PCM 222520 M Plain bearings,Bushings	Ball Bearing	Yes	Cast Iron	7.3 Inch \| 184 Milli
60 mm x 70 mm x 60 mm skf PWM 607060 Plain bearings,Bushings	0	0800675107109	N/A	PT INTERNATIONAL
20 mm x 23 mm x 20 mm skf PRMF 202320 Plain bearings,Bushings	Steel	0.0	17 Degree	Light
60 mm x 75 mm x 60 mm skf PBMF 607560 M1G1 Plain bearings,Bushings	N/A	Single Row \| Spheric	Set Screw	0.62