Machining needle roller bearing is a kind of roller bearing with cylindrical roller. The roller is thin and long relative to its diameter. This kind of roller is called needle roller. Although the bearing has a small cross section, it still has a high load bearing capacity, so it is especially suitable for the occasions with limited radial space. According to the use of radial space limited occasions. The bearing without inner ring or needle roller and cage assembly can be selected according to different application occasions. At this time, the journal surface and shell hole surface matched with the bearing are directly used as the inner and outer rolling surfaces of the bearing. In order to ensure the same load capacity and running performance as the ring bearing, the hardness, machining accuracy and surface quality of the shaft or shell hole raceway surface should be the same as those of the bearing The raceway of the ferrule is similar. This kind of bearing can only bear radial load.