Page 653 - SKF-bearing-housings

Design considerations

Operating temperature Attachment bolt recommendations
The permissible operating temperature is In typical applications, 8.8 class hexagon head
limited by the seals († table 1, page 646). bolts in accordance with ISO 4014 can be used
For temperature limits of SKF bearings and together with washers in accordance with
lubricants, refer to the product information ISO 7089 or 7090. If the load does not act
available online at skf.com/bearings. perpendicularly toward the base, it may be
The housing material does not have any necessary to use stronger 10.9 class bolts.
additional temperature limits, except for very SKF housings can withstand loads resulting
low temperatures where impact strength from tightening the attachment bolts to the
could be a factor. torque values recommended by bolt manufac-
The housing paint is heat resistant up to turers († table 3). They are valid for oiled,
80 °C (175 °F) material temperature or 100 °C but otherwise untreated, thread surfaces.
(210 °F) ambient temperature. SKF cannot guarantee that tightening to the
When temperatures outside the permissible recommended value provides sufficient
range are expected, contact the SKF applica- anchoring. Make sure that attachment bolts,
tion engineering service. stops, and a sufficiently strong support can
accommodate all occurring loads.
Operating speed
The seals limit the permissible operating
speed. Speed limits for the seals are provided
in table 1 on page 646.

Shaft specifications
The bearing seat should be machined accord-
ing to the requirements for bearings mounted
on an adapter sleeve († Specifications for
shafts and housing support surfaces, page 45),
i.e. with a shaft tolerance class h9 V E and a
cylindricity tolerance of IT5/2. The seal coun-
terface should also comply with these
specifications.

Table 3
Torques values for cap bolts and attachment bolts
Housing Cap bolts Attachment bolts
Size Size Tightening Size Tightening
torque torque 1)
– – Nm – Nm

FSDR 39/850 K M 36 600 M 48 5 450
FSDR 39/1060 K M 36 600 M 52 6 990
FSDR 39/1180 K M 36 600 M 52 6 990
15
FSDR 49/1320 K M 42 850 M 52 6 990
FSDR 48/1500 K M 42 850 M 52 6 990

1) Recommended by bolt manufacturers.

649