Page 470 - SKF-bearing-housings

Split pillow blocks SDAF series including the extended range (inch dimensions)

Operating temperature Attachment bolt recommendations
The permissible operating temperature is In typical applications, 8.8 class (SAE J429,
mainly limited by the seals († table 1 on Grade 5) hexagon head bolts can be used
page 456) and the lubricant in the bearing. For together with washers. If the load does not act
temperature limits of SKF bearings and lubri- perpendicularly toward the base, it may be
cants, refer to the product information avail- necessary to use stronger, 10.9 class (SAE
able online at skf.com/bearings. J429, Grade 8) bolts.
The housing material does not have any SKF housings can withstand loads resulting
additional temperature limits, except for very from tightening the attachment bolts to the
low temperature applications where impact torque values recommended by bolt manufac-
strength could be a factor. For additional infor- tures. They are valid for oiled, but otherwise
mation, contact the SKF application engineer- untreated, thread surfaces. SKF cannot guar-
ing service. antee that tightening to the recommended
The housing paint is heat resistant up to value will provide sufficient anchoring. Make
175 °F material temperature or 210 °F ambi- sure that attachment bolts, dowels or stops,
ent temperature. When temperatures outside and a sufficiently strong support can accom-
the permissible range are expected, contact modate all occurring loads.
the SKF application engineering service.

Operating speed
All seals, except non-contact labyrinth seals,
limit the permissible operating speed. Speed
limits for seals are provided in table 1 on
page 456. For speed limits of the bearing,
refer to the product information available
online at skf.com/bearings.
Shaft specifications
Table 6 lists the recommended shaft diameter
tolerances. The values d a , d b and d c are listed
in the product tables starting on page 472.
The tolerance class for the bearing shaft seat
should be selected from the SKF rolling bear-
ings catalogue.
Table 6
Shaft tolerances
Nominal Diameter tolerance limits
diameter Adapter mounting Cylindrical mounting
over incl. d a d b , d c
high low high low
in. in.

1 /2 1 0 –0.002 – –
1 2 0 –0.003 0 –0.003
2 4 0 –0.004 0 –0.003
4 6 0 –0.005 0 –0.003
6 10 0 –0.006 0 –0.004
10 15 0 –0.006 0 –0.005
15 0 –0.006 0 –0.006

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