Needle Roller Bearing NA 4904
The NA 4904 bearing is a needle bearing with an inner diameter of 20 mm , an outer diameter of 25 mm, a width of 37 mm. It typically uses P0 grade precision tolerances and open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
Needle bearing with fine and long roller (3 ~ 10 times the diameter of the roller length is, straightDiameter is generally not more than 5 mm), so the radial structure is compact, its diameter and load capacity at the same time, with other types of bearing outside diameter to a minimum, especially suitable for the limited size of the radial installation support structure. Needle roller bearing according to the use of different occasions, the machining accuracy and surface quality and bearing ring. Use combined needle roller bearing is by centripetal needle bearing and thrust bearing parts of the bearing unit
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