Single row deep groove ball bearings are produced with Normal radial internal clearance (CN or C0 not marked on bearing) as standard. Radial clearance selection is based on factors such as high speed, operating temperature, shaft fits and axial movement limitations. The availability of bearings with clearances other than normal should be checked before ordering. Many of the bearings, particularly the smaller sizes, are also available with radial internal clearance, which is greater than or less than Normal.
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