NK / NKS / RNA49 Heavy Duty Needle Roller Bearings Yoke Track Rollers For Power Tools

Electric Motors NKI12/20 Needle Bearings Textile Machine Pumps

Description:

Needle Roller Bearings

Needle Roller Bearings are bearings which uses small cylindrical rollers.
They are used to reduce friction of a rotating surface.
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 the 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.

1. Radial Needle and Cage Assemblies(K type)
2. Outer circle with double lock needle roller bearing(NA,NKI,RNA,NK type)
3. Outer with double raised edge single row needle roller bearing(NA,NKI,RNA,NK type)
4. Outer with double raised edge double row needle roller bearing(NA,RNA type)
5. Stamping outer needle roller bearing(HK,BK type)

Applications: 

Needle bearings are heavily used in automobile components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least eight needle bearings (four 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.

Specifications