Deep groove ball bearings are one of the most common types of rolling bearings. The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls, and a set of retainers. Deep groove ball bearings are available in single-row and double-row configurations. Their structural variations include sealed and open designs. Open bearings lack sealing structures, while sealed deep groove ball bearings feature either dust seals or oil seals. Dust seals are made of stamped steel plates, providing basic protection against dust entering the bearing raceways. Oil seals are contact-type seals that effectively prevent lubricant leakage from the bearing.

Single-row deep groove ball bearings are designated with the prefix 6, while double-row types use the prefix 4. Their simple structure and ease of use make them widely produced and extensively applied. Deep groove ball bearings primarily handle radial loads but can also accommodate combined radial and axial loads. When subjected solely to radial loads, they exhibit zero contact angle. When deep groove ball bearings have substantial radial clearance, they exhibit characteristics similar to angular contact bearings, enabling them to handle significant axial loads. These bearings feature a very low coefficient of friction and can operate at extremely high rotational speeds.

Due to their simple structure, deep groove ball bearings achieve high manufacturing precision more easily than other types. This facilitates mass production in standardized series, resulting in lower manufacturing costs and widespread adoption. Beyond the basic design, deep groove ball bearings feature various modified structures, including: - Deep groove ball bearings with dust covers - Deep groove ball bearings with rubber seals - Deep groove ball bearings with retaining grooves - Deep groove ball bearings with ball-retaining notches for high load capacity - Double-row deep groove ball bearings