Skateboard Spare Parts Needle Roller Bearings NK25/16 NKIS , NA49 , NA69 Customized

Skateboard NK25/16 Needle Roller Bearings Fans Textile Machine

Description:

Needle Roller Bearings

Needle Roller Bearings (needle bearing) is a roller with a cylindrical roller bearings, relative to its diameter, both the thin and long rollers. This is called needle roller. Despite its smaller cross-section, still has a higher load bearing capacity, therefore, especially suitable for the radial space-constrained occasions.
Needle contour surface in the proximal surface of the slight contraction. Needle and raceway contact line results can be amended to avoid damaging the edge of the stress.
Needle Roller Bearing characteristics and uses:
Equipped with a thin and long needle bearing roller (roller diameter, length 3 to 10 times the diameter of generally not more than 5mm), so the radial structure is compact, its diameter size and payload capacity compared with other types of bearings the same time, diameter minimum, especially for the radial bearing installation dimensions restricted results. According to the use of different occasions, may make use of, or needle roller bearings without inner ring and cage components, this time to match with the bearing journal surface and the surface of shell holes directly as bearing inner and outer rolling surface, in order to ensure the load capacity and operating performance and a ring bearing the same shaft or housing bore raceway surface hardness, machining accuracy and surface quality should be similar raceway of the bearing rings. Such bearings can only bear the radial load.

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