Such is mainly used for needle roller bearings

Roller bearings are mainly radial cylindrical roller, double row spherical roller, tapered roller and thrust roller and structure type.
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Roller Bearings

Cylindrical roller bearings
Such roller is mainly used for cylindrical roller bearings, roller assemblies can also be used directly for machinery. This class roller has been standardized in size, can be used as commodities roller for design and user choice. [1]
Long cylindrical roller backing bearings
This class roller shaft divided in two with and without shaft, mainly for long cylindrical roller bearings, roller assemblies can also be used directly for machinery.
Needle roller Stainless steel slewing bearing
Such is mainly used for needle roller bearings, needle bearing universal joints and thrust needle roller bearings, needle roller assembly can also be used directly for machinery. This class roller has been serialized in size for the design choices. Bearing structure according to the needs of both ends of the needle shape of cone-shaped head, flat head shape, round shape.
Tapered Roller Bearings
A circular truncated cone, the cone angle is typically 1 ° ~ 4 ° 20 ', is also less than 1 ° or greater than 4 ° 20', mostly 2 °. Roller length is generally not more than twice the diameter of the large end rollers. Such rollers are used for tapered roller bearings, roller large cone angle is basically used for thrust tapered roller bearings.
Spherical roller bearings
Roller raceway spherical shape. With this roller bearings with self-aligning properties, can withstand large loads. Spherical roller of asymmetric and symmetric shape, generally large end asymmetrical spherical, symmetrical both end faces of the flat face. Symmetrical spherical roller better performance, rather than the symmetrical form for elimination. Such roller for spherical roller bearings and spherical roller thrust bearings.