Bearing NO.    Boundary dimensions(mm) d    D    B RMS4    12.7    41.28    15.88 RMS5    15.875    46.04    15.88 RMS6    19.05    50.8    17.46 RMS7    22.225    57.15    17.46 RMS8    25.4    63.5    19.05 RMS9    28.575    71.44    20.64 RMS10    31.75    79.37    22.23 RMS11    34. 925    88.9    22.23 RMS12    38.1    95.25    22.81 RMS13    41.275    101.0    23.81 RMS14    44.45    108    26.99 RMS15    47.625    114.3    26.99 RMS16    50.8    114.3    26.99 RMS18    57.15    127    31.75 RMS20    63.5    139.5    31.75 RMS22    69.85    158.8    34.93 RMS15-2RS Nonstandard Deep Groove Ball Bearings Features: 1. High quality through hardened bearing steel used for basic construction. 2. Optimized raceway geometry and super finishing. 3. High precision accuracy and manufacturing consistency. 4. Proprietary high performance sealing options. 5. Premium grease as lubrication system. RMS15-2RS Nonstandard Deep Groove Ball Bearings Working 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.