SKF - Rolling Bearings

Temperature limits
Temperature factor f T
Operating temperature
°C °F –
Factor
f T
150 300 1
200 390 0,9
250 480 0,75
300 570 0,6
350 660 0,45
Guideline values for dynamic load safety factor S req
Table 3
Table 4
Temperature limits
The graphite-based lubricant in SKF DryLube
bearings is effective at temperatures up to
500 °C (930 °F). At temperatures above
250 °C (480 °F), the resin binder begins to
degrade, but the dry lubricant continues to
lubricate. Therefore, for continuous operation
at temperatures above 250 °C (480 °F), SKF
recommends using bearings with a shield on
both sides (designation suffix 2Z), or with a
metal seal on both sides († fig. 66, page 236)
to keep the lubricant in the bearing. Bearings
with dry lubricant only between the inner ring
(or the shaft washer) and cage († Bearing
data, page 1196) may work at elevated temperatures
without shields.
The recommended temperature limits are
listed in table 1 († page 1195).
Application
S req
Machines used for short periods or
intermittently: cooling beds, guide rolls
Machines used for short periods or
intermittently where high operational
reliability is required: cranes in metals
applications
Machines in use 8 hours per day and
fully utilized: conveyor belts, hardening
and annealing ovens
Machines in use 24 hours per day:
conveyor systems, equipment in continuous
casting mills
3
5
10
12
15D
1201