SKF - Rolling Bearings

Shields
On request, Y-bearings can be supplied with
a shield on both sides. The sheet steel shields
are fitted in a recess on the outer ring and do
not make contact with the inner ring, but form
a narrow gap († fig. 22, designation suffix
VP076). They are designed for applications
where the contamination level is low and additional
friction should be avoided. Bearings
with shields should not be used if water, steam
or moisture can enter the bearing.
Greases for capped bearings
Y-bearings are filled with one of the following
greases:
• SKF Energy Efficient Y-bearings
† low-friction grease GE2
• zinc-coated and stainless steel Y-bearings
† food-grade grease GFJ
This grease fulfils the requirements listed in
the Guidelines of section 21 CFR 178.3570
of the FDA (US Food and Drug Administration)
regulations. It is approved by the USDA
(United States Department of Agriculture)
for Category H1 use (occasional contact
with food stuffs).
• all other –50 Y-bearings 0 50 100 150 200 250 °C
† standard grease VT307
The technical specifications for the various
greases are listed in table 1.
Design and variants
Fig. 22
2
Technical specifications of SKF greases for Y-bearings
Table 1
Grease Temperature range 1) Thickener Base
oil type
–50 0 50 100 150 200 250 °C
NLGI
consistency
class
Base oil viscosity [mm 2 /s]
at 40°C at 100 °C
(105 °F) (210 °F)
VT307
Lithiumcalcium
soap
Mineral 2 190 15
GFJ
Aluminiumcomplex
soap
Synthetic
hydrocarbon
2 100 14
GE2 Lithium soap Synthetic 2 25 4,9
–60 30 120 210 300 390 480 °F
1) Refer to the SKF traffic light concept † page XX 244
431