Deep groove ball bearings are the most common type 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 cages. There are two types of deep groove ball bearings: single row and double row. Deep groove ball structures are also divided into sealed and open structures. Open type means that the bearing does not have a sealed structure. Sealed deep groove balls are divided into dust-proof seals and oil-proof ones. seal. The dust-proof sealing cover is made of stamped steel plate and simply prevents dust from entering the bearing raceway. The oil-proof type is a contact oil seal, which can effectively prevent the grease in the bearing from escaping. The single row deep groove ball bearing type code is 6, and the double row deep groove ball bearing type code is 4. It has a simple structure and is easy to use. It is the most commonly produced and widely used type of bearing.