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Needle bearing  is a roller with a cylindrical roller bearing, relative to its diameter, both thin and long rollers. This is called needle roller. Despite the smaller cross-section, has a higher load bearing capacity, therefore, especially suitable for the radial space-constrained applications. 

Needle bearing  characteristics and uses : 

With thin and long needle bearing roller (roller diameter, length 3 to 10 times the diameter of generally not more than 5mm), so the radial structure is compact, its diameter size and loadbearing capacity and other types of the same, minimum diameter, especially for radial bearinginstallation dimensions restricted results. Depending on different occasions, can be used without inner ring of the bearing or needle roller and cage assemblies, this time with the match of the journal bearing surface and shell holes as bearing directly on the surface, the outer rolling surface, in order to ensure the load capacity and operating performance and have the same ring bearing, shaft or housing bore raceway surface hardness, machining accuracy andsurface quality should be similar to the roller bearing rings. Such bearings can only bear theradial load.