SKF - Rolling Bearings

15A Sensor bearing units
Bearing data
Dimension
standards
Tolerances
For additional
information
(† page 132)
Internal
clearance
For additional
information
(† page 149)
Boundary dimensions:
ISO 15
However, the width of
the complete unit is
6,2 mm wider.
d ≤ 25 mm † P5
d ≥ 30 mm † P6
Values:
ISO 492
(† tables 4 and 5,
pages 138 and 139)
C3
Values:
ISO 5753-1,
(† table 6, page 314)
Values are valid for
unmounted units
under zero measuring
load.
Loads
For information about minimum load and
equivalent bearing loads, refer to Deep groove
ball bearings († Loads, page 316).
Temperature limits
SKF motor encoder units have been tested
successfully under various speeds and loads:
• 500 hours at 120 °C (250 °F) with intermittent
peaks of up to 10 minutes at 150 °C
(300 °F)
• 100 hours at –40 °C (–40 °F)
The permissible operating temperature for
SKF motor encoder units can be limited by:
• the dimensional stability of the bearing
rings and balls
• the cage
• the seal
• the lubricant
• the sensor
When temperatures outside the permissible
range are expected, contact the SKF application
engineering service.
Bearing rings and balls
The bearing rings and balls undergo a special
heat treatment. The bearings are heat stabilized
up to at least 120 °C (250 °F).
Cages
Steel cages can be used at the same operating
temperatures as the bearing rings and balls.
For temperature limits of polymer cages, refer
to Cage materials († page 152).
Seal
The permissible operating temperature for
NBR seals is –40 to +100 °C (–40 to +210 °F).
Lubricant
Temperature limits for the WT grease used in
SKF motor encoder units are provided under
Deep groove ball bearings († table 4, page
305).
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