SKF - Rolling Bearings

Grease lubrication
Table 1
Speed ranges for grease lubricated radial bearings
Speed range
Speed factor
Ball bearings
A = n d m
Needle roller, spherical roller,
tapered roller, CARB toroidal
roller bearings
Cylindrical roller bearings
– mm/min
VL Very slow – < 30 000 < 30 000
L Slow < 100 000 < 75 000 < 75 000
M Medium < 300 000 < 210 000 < 270 000
H High < 500 000 ≥ 210 000 ≥ 270 000
VH Very high < 700 000 – –
EH Extremely high ≥ 700 000 – –
n = rotational speed [r/min]
d m = bearing mean diameter [mm]
= 0,5 (d + D)
Note: Reliable grease life calculations can only be made considering the speed intervals listed in this table.
Table 2
Table 3
Temperature ranges for greases
Temperature range Range
– °C °F
Load ranges for greases
Load range
Load ratio
C/P
L Low < 50 < 120
M Medium 50 to 100 120 to 210
H High 100 to 150 210 to 300
VH Very high > 150 > 300
L Low > 15
M Medium > 8
H High < 4
VH Very high < 2
G
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