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 RMS12-2RS Nonstandard Deep Groove Ball Bearings Advantages: 1. High operation precision; 2. Most rolling bearings can also be subjected to radial and axial loads, so the combined structure of bearings is simple; 3. For axle diameters of the same size, the width of rolling bearing is smaller than that of sliding bearing, which can make the axial structure of machinery compact; 4. Under ordinary conditions, the efficiency of rolling bearing is equal to that of hydrodynamic smooth bearing, but higher than that of inclusion smooth bearing. Shipping Methods: 1. For small amount (GW<100KGS), we can send you by express, such as DHL, Fedex, TNT etc 2. For GW between 100KGS to 500KGS, we can send you by sea shipping or air shipping 3. For large amount (GW > 500KGS), we can send you by sea