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MOUNTING AND FITTING (continued) _____________________________________________________________________

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Values for Interference Factor f_p

BEARING RING THINKNESS Inches	MATING MATERIAL
BEARING RING THINKNESS Inches	STEEL	BRASS/ALUMINUM	PLASTIC (filled)
<0.015	0.8	0.6	0.3
0.015 - 0.030	0.7	0.4	0.2
>0.030	0.6	0.2	0

*Bearing ring thickness is calculated as follows:

          Inner ring thickness = l_i - d       where:    d              =              bearing bore                                                                                      2                          D             =              bearing O.D.
          Outer ring thickness = D - l_o                     l_i             =              inner ring land diameter*
                                                       2                         l_o             =              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.

SHOULDER DESIGN

Shoulder diameter

When a bearing is located against a shoulder in the mating part, care must be taken that the rim of the shoulder clears the opposing ring. This is achieved when the diameter of the shoulder has clearance over the opposing race land diameter.

Clearance should be > .010 inch (.25 mm) to allow for normal tolerances.

Maximum shaft shoulder diameter = Outer ring land diameter* - clearance
Minimum housing shoulder diameter = Inner ring land diameter* + clearance

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

Shoulder corner radius

The corner radius of the shoulder (r_a) should be less than the fillet radius (r) of the mating bearing to allow the bearing to fully seat against the shoulder. The maximum shoulder corner fillet radii for bearings are given in the individual bearing tables.

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