Page 499 - SKF-bearing-housings

Design considerations

stop should be sufficiently strong to accom- • Housings with suffix G
modate the loads acting parallel to the support The recommended shaft tolerance class for
surface. bearings with a bore diameter up to 140 mm
is p6V E , and for larger bearings r6V E . Where
a labyrinth ring is mounted on a separate
Operating temperature seat, the recommended shaft tolerance
The permissible operating temperature is class is h6V E .
mainly limited by the adapter ring († table 2,
page 491) and the lubricant. For temperature The recommended shaft tolerances under the
limits of SKF bearings and lubricants, refer to labyrinth rings are also provided in the illus-
the product information available online at skf. trations in the product tables.
com/bearings.
The housing material does not have any
additional temperature limits, except for very Attachment bolt recommendations
low temperature applications where impact In typical applications 8.8 class hexagonal
strength could be a factor. bolts in accordance with ISO 4014 can be used
The housing paint is heat resistant up to together with washers. If the load does not act
80 °C (175 °F) material temperature or 100 °C perpendicularly toward the base, it may be
(210 °F) ambient temperature. necessary to use stronger 10.9 class bolts.
When temperatures outside the permissible SKF housings can withstand loads resulting
range are expected, contact the SKF applica- from tightening the attachment bolts to the
tion engineering service. torque values recommended by bolt manufac-
turers († table 5 on page 500). They are
valid for oiled, but otherwise untreated, thread
Operating speed surfaces. SKF cannot guarantee that tighten-
The permissible operating speed of the incorp- ing to the recommended value will provide
orated bearing is not limited by the housing. sufficient anchoring. Make sure that attach-
ment bolts, dowels or stops, and a sufficiently 10
strong support can accommodate all occurring
Shaft specifications loads.
When a labyrinth ring is mounted on the same
shaft diameter as the bearing, its seat should
comply with the tolerances required by the
bearing.

• Housings without suffix
The recommended shaft tolerance class is
h9V E .
• Housings with suffix C
The recommended shaft tolerance class is
h6V E (both under the adapter sleeve and the
labyrinth rings).
• Housings with suffix E
The recommended shaft tolerance class for
bearings with a bore diameter up to 140 mm
is p6V E , and for larger bearings r6V E . The
shaft tolerance class under the outer laby-
rinth seal is h6V E .

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