Deep groove ball bearings are used in a wide variety of applications, they are simple in design, non-separable, suitable for high speeds and are robust in operation, and need little maintenance. Deep raceway grooves and the close conformity between the raceway grooves and the balls enable deep groove ball bearings to accommodate axial loads in both directions, in addition to radial loads.The single row deep groove ball bearing is the most representative type of rolling bearing and is widely used. It primarily consists of an inner ring, an outer ring, steel balls (rolling elements), and a cage. In addition to open designs, these bearings are available with steel dust shields (ZZ type), rubber seals (2RS type), or a snap ring on the outer ring's outside diameter (NR type). Pressed steel cages are commonly used.Double row deep groove ball bearings feature a deep-groove raceway design; standard models include the 4200A and 4300A series. While sharing the same inner and outer diameters as single-row deep groove ball bearings, they possess a greater axial width and offer significantly higher radial load-carrying capacity, making them suitable for applications where single-row bearings are insufficient.