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
41,275 mm x 45,244 mm x 38,1 mm skf PCZ 2624 M Plain bearings,Bushings	0.0	QM INDUSTRIES	Bearings	0883450449939
75 mm x 80 mm x 70 mm skf PRMF 758070 Plain bearings,Bushings	Bearing	Spherical	Not Applicable	Shaft Mount
18 mm x 20 mm x 15 mm skf PCM 182015 M Plain bearings,Bushings	Not Applicable	48	Spherical	13.386 Inch \| 340 Mi
41,275 mm x 45,244 mm x 38,1 mm skf PCZ 2624 E Plain bearings,Bushings	0.1	BEARINGS LIMITED	0888569044549	B00308
20 mm x 26 mm x 25 mm skf PSMF 202625 A51 Plain bearings,Bushings	1.75 Inch \| 44.45 Mi	Inch	1 Inch \| 25.4 Millim	Cam Follower and Tra
18 mm x 20 mm x 15 mm skf PCM 182015 E Plain bearings,Bushings	16 Millimeter	Thermoplastic	5.8 Inch \| 148 Milli	Single Row \| Spheric
5 mm x 10 mm x 10 mm skf PBM 051010 M1 Plain bearings,Bushings	1.87	ASAHI BEARINGS	N/A	0.0
70 mm x 80 mm x 60 mm skf PSM 708060 A51 Plain bearings,Bushings	Bearings	N/A	INA	0.0
8 mm x 12 mm x 8 mm skf PSM 081208 A51 Plain bearings,Bushings	Tapered Roller Beari	0.0	90031	749
25 mm x 30 mm x 20 mm skf PSM 253020 A51 Plain bearings,Bushings	Flange Block	0.0	1 Piece Solid	2 Bolt Flange Block;
15,875 mm x 18,256 mm x 22,225 mm skf PCZ 1014 M Plain bearings,Bushings	NSK	0 Inch \| 0 Millimete	15MM Bore; 32MM Outs	0.0684
80 mm x 95 mm x 100 mm skf PSM 8095100 A51 Plain bearings,Bushings	8483.20.40.80	4.09 Inch \| 103.886	2 Bolt Pillow Block;	Inch