Needle roller bearings are roller bearings with cylindrical rollers. Compared to their diameter, the rollers are both thin and long. This type of roller is called a needle roller, and although it has a small cross-section, the bearing still has a high load bearing capacity. Needle roller bearings are equipped with thin and long rollers, so their radial structure is compact. Their inner diameter size and load capacity are the same as other types of bearings, and their outer diameter is small, making them particularly suitable for support structures with limited radial installation dimensions.

According to different usage scenarios, bearings without inner rings or needle rollers and cage components can be selected. At this time, the journal surface and outer shell hole surface that match the bearing are directly used as the inner and outer rolling surfaces of the bearing. To ensure the same load capacity and operating performance as bearings with ring rings, the hardness, processing accuracy, and surface quality of the shaft or outer shell hole raceway surface should be similar to those of the bearing ring raceway. This type of bearing can only withstand radial loads.

Needle roller bearings have a high load-bearing capacity and are suitable for supporting structures with limited installation dimensions. The journal surface is hardened as a rolling surface, and the bearing is inserted into the seat hole by pressing fit without the need for axial positioning.