Bearing NO.    Boundary dimensions(mm) d    D    B RLS4    12.7    33.34    9.525 RLS5    15.875    39.69    11.11 RLS6    19.05    47.63    14.29 RLS7    22.225    50.8    14.23 RLS8    25.4    57.15    15.88 RLS9    28.575    63.5    15.88 RLS10    31.75    69.85    17.46 RLS11    34. 925    76.2    17.46 RLS12    38.1    82..55    19.05 RLS13    41.275    88.9    19.05 RLS14    44.45    95.25    20.64 RLS15    47.625    101.6    20.64 RLS16    50.8    101.6    20.64 RLS18    57.15    114.3    22.23 RLS20    63.5    127    23.81 RLS22    69.85    133.4    23.81 RLS18-2RS Nonstandard Deep Groove Ball Bearings Advantages: 1. Improved bearing life reliability. 2. Reduced friction, vibration and noise during operation 3. 100% vibration/noise testing for fractional HP to high HP electrical applications. 4. Globally interchangeable for use in existing applications. 5. Best seal solutions extend equipment life in contaminated applications.