Editing Rolling-element bearing (section)

====Needle roller====
[[File:Needle bearing.jpg|left|thumb|100px|A needle roller bearing]]
{{Main|Needle roller bearing}}

The needle roller bearing is a special type of roller bearing which uses long, thin cylindrical rollers resembling needles. Often the ends of the rollers taper to points, and these are used to keep the rollers captive, or they may be hemispherical and not captive but held by the shaft itself or a similar arrangement. Since the rollers are thin, the outside diameter of the bearing is only slightly larger than the hole in the middle. However, the small-diameter rollers must bend sharply where they contact the races, and thus the bearing [[Fatigue (material)|fatigues]] relatively quickly.
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