NA 4900 Needle Roller Bearings
The NA 4900 bearing is a Needle Roller Bearings with an inner diameter of 10 mm , an outer diameter of 22 mm, a width of 13 mm. It typically uses p0 p6 p5 p4 grade precision tolerances and open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
NA 4900 10x22x13mm
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Needle bearings have a large surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less added clearance (difference between the diameter of the shaft and the diameter of the bearing) so they are much more compact. The typical structure consists of a needle cage which orients and contains the needle rollers, the needle rollers themselves, and an outer race(sometimes housing itself). Radial needle bearings are cylindrical and use rollers parallel to the axis of the shaft. Thrust needle bearings are flat and use a radial pattern of needles. Full complement bearings have solid inner and outer rings and rib-guided cylindrical rollers. Since these bearings have the largest possible number of rolling elements, they have extremely high radial load carrying capacity and are suitable for particularly compact designs. Needle bearings are heavily used in engine components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least 8 needle bearings (4 in each U joint) and often more if it is particularly long, or operates on steep slopes. Additional clarification of Needle Roller: According to "Marks' Standard Handbook for Mechanical Engineers", a Needle Bearing is a roller bearing with rollers whose length are at least four times their diameter. products: HK BK series HK Drawn cup needle roller bearings with open ends
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Part of Needle roller bearing specification:
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