Open and sealed two structures. There are open bearings, bearings with dust covers, seals or snap rings. Open type means that the bearing does not have a sealed structure, and the sealed thin-walled deep groove ball is divided into dust-proof seal and oil-proof seal. The material of the dust-proof sealing cover is stamped steel plate, which only serves to prevent 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 overflowing.

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