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.