Where interference fits are achieved by pressing a shaft into a bearing or
      a bearing into a housing, particular care must be taken in dimensioning
      and tolerancing mating parts. Radial play values of will be reduced by an
      amount proportional to the interference.
      ∆rf =  ∆r-fp • I      where: ∆rf = final radial play after pressing part
                                                ∆r = initial radial play
                                                fp = interference factor
                                                I   = interference between
      bearing and mating part
      The interference factor fp is dependent on the thickness of the bearing
      ring and the material and geometry of the mating part. It is suggested
      that the following empirically determined values are used:

           
            BEARING RING THINKNESS InchesMATING MATERIAL
            STEELBRASS/ALUMINUMPLASTIC (filled)
            <0.0150.80.60.3
            0.015 - 0.0300.70.40.2
            >0.0300.60.20

      *Bearing ring thickness is calculated as follows:

      Inner ring thickness =  li - d       where:    d       =        bearing
      bore                                                                      
       2                      D           =           bearing O.D.
      Outer ring thickness =  D - lo                  li            =        
      inner ring land diameter*
                                                2                      lo       
      =       outer ring land Diameter*          

      (*Land diameters are given in the individual bearing specification
tables.)

      Note that the above fp values are intended as a guideline only. If the
      mating part itself has a thin section, then the above factors will be
      reduced slightly. The important point is that interference can
      significantly reduce radial play and must be accounted for in a design to
      arrive at the final desired radial play. For this reason it is recommended
      that a higher radial play (e.g. MC5 - 0.0005" to 0.0008") be used where
      interference fit is needed.

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