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Needle Bearings are a small cylindrical type of roller bearings which are used to prevent friction between moving surfaces which have low rotational speeds. Needle roller bearings are usually used when space is at a premium as needle bearings are much more compact than ball bearings. Needle Bearings come with an ability to use mating surfaces as inner or outer raceways, or both. Bearing load ratings typically are based on raceway hardness of 58 Rc or equivalent. If it is lower, the capacity of the bearing-raceway combination is reduced.