Needle roller bearings are roller bearings with cylindrical rollers, relative to its diameter, the roller is both thin and long, this roller is called needle roller, despite having a small cross-section, the bearing still has a high load bearing capacity, needle roller bearings are equipped with thin and long rollers, so the radial structure is compact, its inner diameter size and load capacity with other types of bearings, the outer diameter is smaller, especially suitable for radial installation size is restricted support structure The outer diameter is smaller when the inner diameter size and load capacity are the same as other types.

According to the use of different occasions, can choose no inner ring bearings or needle roller and keep frame components, this time with the bearing with the journal surface and shell hole surface directly as the bearing of the inner and outer rolling surface, in order to ensure the load capacity and running performance and have the same ring bearing, shaft or shell hole raceway surface hardness, machining accuracy and surface quality should be similar to the bearing sleeve raceway. This kind of bearing can only bear radial load.

Needle roller bearing bearing capacity, suitable for installation size restricted support structure, journal surface by hardening as rolling surface, bearing with pressed into the fit into the seat hole, without it again for axial positioning.