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Model Specifications: 63801-2RS Deep Groove Ball Rolling Bearing, used to replace worn or damaged mechanical bearings. Applications: Suitable for various precision mechanical equipment, industrial devices, and rotary transmission systems. Material: Made of bearing steel, with a double-sided sealing structure (2RS), dustproof and contamination-proof. Dimensions: Inner diameter 12mm, outer diameter 21mm, thickness 7mm; deeper structural design compared to the conventional 6801 bearing (thickness 5mm). Function: Reduces rotational friction, improving the operational stability and service life of mechanical equipment.