Structurally, each ring of deep groove ball bearings has a continuous groove raceway with a cross-section of about one-third of the circumference of the equatorial circle of the ball. Deep groove ball bearings are mainly used to bear radial loads, but also can bear certain axial loads. When the radial clearance of the bearing increases, it has the property of angular contact ball bearing and can bear the axial load alternating in two directions. Compared with other types of bearings with the same size, this type of bearing has small friction coefficient, high limit speed and high precision. It is the preferred bearing type for users to select. Deep groove ball bearings are simple in structure and easy to use. They are the bearings with the largest production batch and the widest range of applications.