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Shoulder and Fillet Dimensions
The shoulders of the shaft or housing in contact with the face of a bearing must be perpendicular to the shaft center line. The front face side shoulder bore of the housing for a tapered roller bearing should be parallel with the bearing axis in order to avoid interference with the cage.
The fillets of the shaft and housing should not come in contact with the bearing chamfer; therefore, the fillet radius,  , must be smaller than the minimum bearing chamfer dimension,  or  .
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The shoulder heights for both shafts and housings for radial bearings should be sufficient to provide good support over the face of the bearings, but enough face should extend beyond the shoulder to permit the use of special dismounting tools. The recommended minimum shoulder heights for metric series radial bearings are listed in the following table . Nominal dimensions associated with bearing mounting, including the proper shoulder diameters, are listed in the bearing tables. Sufficient shoulder height is particularly important for supporting the side ribs of tapered roller bearings and cylindrical roller bearings subjected to high axial loads.
For dimension for undercut shafts, click here .
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