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
12 mm x 14 mm x 15 mm skf PCM 121415 M Plain bearings,Bushings	N/A	QM INDUSTRIES	M06288	TIMKEN
14 mm x 16 mm x 25 mm skf PCM 141625 E Plain bearings,Bushings	Take Up	Take Up Unit Bearing	Bearing	0662327141387
65 mm x 80 mm x 35 mm skf PBMF 658035 M1G1 Plain bearings,Bushings	3.346 Inch \| 85 Mill	Yes	15 Degree	Single Row \| Angular
70 mm x 75 mm x 40 mm skf PRMF 707540 Plain bearings,Bushings	Mounted Units &	M06288	134	0883450414340
16 mm x 22 mm x 12 mm skf PBMF 162212 M1G1 Plain bearings,Bushings	PT INTERNATIONAL	Mounted Units &	M06110	PT INTERNATIONAL
12,7 mm x 15,081 mm x 12,7 mm skf PCZ 0808 M Plain bearings,Bushings	2.165 Inch \| 55 Mill	Steel	Not Applicable Inch	C3-Loose
12 mm x 14 mm x 15 mm skf PCM 121415 E Plain bearings,Bushings	8.119	Spherical Roller Bea	31171533	M06288
10 mm x 16 mm x 8 mm skf PSM 101608 A51 Plain bearings,Bushings	Set Screw	Inch	0 Inch \| 0 Millimete	Cast Iron
32 mm x 36 mm x 30 mm skf PRM 323630 Plain bearings,Bushings	N/A	Bearings	B04334	BEARINGS LIMITED
95 mm x 115 mm x 80 mm skf PBM 9511580 M1G1 Plain bearings,Bushings	Bearings	0.42	B00234	SKF
4 mm x 10 mm x 8 mm skf PSM 041008 A51 Plain bearings,Bushings	Cone	TIMKEN	B04334	N/A
88,9 mm x 93,663 mm x 95,25 mm skf PCZ 5660 M Plain bearings,Bushings	0692314481554	Bearings	NTN	M06110