‌Radial needle roller and cage assembly‌ is an independent rolling element, mainly composed of cage and needle roller, without bearing inner and outer rings. This design makes it particularly suitable for occasions where the shaft and bearing housing can be used as raceways, and can provide high load and high rigidity capabilities in a narrow radial structural space. In addition, they also have high rotation accuracy, simple installation conditions and low production costs, so they are very popular in applications that require high precision and low-cost solutions.