| Bearing number | Size range | Structure characteristic | 
        
            | Bearing number | Former bearing number | Inner diameter | Outer diameter | 
        
            | N200 series | 2200 series | More than 15mm | Less than 580mm | Except basal structure, also provide transformative structure | 
        
            | NU200 series | 32200 series | More than 15mm | Less than 580mm | Except basal structure, also provide transformative structure | 
        
            | NJ200 series | 42200 series | More than 15mm | Less than 580mm | Except basal structure, also provide transformative structure | 
        
            | NF200 series | 12200 series | More than 15mm | Less than 580mm | Except basal structure, also provide transformative structure | 
        
            | N300 series | 2300 series | More than 17mm | Less than 580mm | Except basal structure, also provide transformative structure | 
        
            | NU300 series | 32300 series | More than 17mm | Less than 580mm | Except basal structure, also provide transformative structure | 
        
            | NJ300 series | 42300 series | More than 17mm | Less than 580mm | Except basal structure, also provide transformative structure | 
        
            | NF300 series | 12300 series | More than 17mm | Less than 580mm |   Except basal structure, also provide transformative structure | 
        
            | N400 series | 2400 series | More than 17mm | Less than 380mm |  Except basal structure, also provide transformative structure | 
        
            | NU400 series | 32400 series | More than 17mm | Less than 380mm | Except basal structure, also provide transformative structure | 
        
            | NJ400 series | 42400 series | More than 17mm | Less than 380mm | Except basal structure, also provide transformative structure | 
        
            | NF400 series | 12400 series | More than 17mm | Less than 380mm | Except basal structure, also provide transformative structure |