A needle roller bearing is a bearing which uses small cylindrical rollers.The difference of a needle roller bearing and roller bearing is the ratio of diameter and length of their rollers, when the ratio of the diameter and the length of roller of a roller bearing is between the interval of 0.4 to 0.1, that roller bearing is called as needle rolle...
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http://en.wikipedia.org/wiki/Needle_roller_bearing
A special bearing which has a small OD when compared to its ID. The rolling elements take the form of needle rollers that allow high radial loads to be taken. Not capable of taking axial loads.
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https://www.encyclo.co.uk/local/20687
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