Do ball bearings come with dust seals?

There is no unified answer to whether ball bearings come with dust seals, as it depends on the specific type, design, and manufacturer's choice of ball bearing.
Generally speaking, the dustproof and sealing performance of ball bearings is one of the important factors that need to be considered in design. In certain types of ball bearings, such as deep groove ball bearings, models with dust covers or sealing rings may be provided. These dust covers or sealing rings can effectively prevent contaminants from entering the interior of the bearing, protecting its lubrication performance and operational stability. These dust covers or seals may be included as part of the bearing or provided as optional accessories.
However, not all ball bearings come with dust seals. Some bearings may adopt other forms of sealing structures, such as labyrinth seals, contact seals, etc., to achieve similar dust and sealing effects. In addition, some bearings may not have dust-proof or sealing functions, but rely on external devices or systems to provide necessary protection.
Therefore, when selecting ball bearings, it is necessary to choose the appropriate bearing type and dust-proof sealing structure based on specific application scenarios and requirements. If you need bearings with high dust and sealing performance, you can choose models with dust covers or sealing rings, or consider using other forms of sealing structures. If unsure about how to choose, it is recommended to consult a professional bearing manufacturer or salesperson for more detailed and professional advice.