SKF - Industrial Shaft Seals

Shaft requirements
Sharp edges, nicks and burrs on the shaft must
be avoided to prevent damage to the V-ring
during installation.
V-rings rotate with the shaft and only require
a moderate surface roughness value. As a general
guideline, the value should not exceed R a 6,3 µm
(252 µin.). When sealing fluids or exposed to
fine, solid contaminants, the V-ring requires a
surface roughness value of maximum R a 3,2 µm
(128 µin.).
A V-ring is stretched when installed and fits
all shaft diameters within the ranges listed in
the product tables.
Installing V-rings
V-rings are elastic and can be stretched and
pushed over other components, which facilitates
the installation († fig. 10). When several V-rings
are to be installed, a simple tool († fig. 11) can
be used to push the seals to their position at a
predetermined distance from the counterface.
V-rings can also be cut and rejoined in the field.
The general installation guidelines include the
following:
Installing a V-ring
Installation tool
Fig. 10
Fig. 11
• Clean the V-ring, counterface and shaft.
• Make sure that the shaft is dry and free from
grease or oil, particularly when installing a
V-ring without axial support.
• Lubricate the lip of the V-ring with a thin film
of grease or silicone oil.
• In applications where friction must be reduced
to a minimum, the counterface should be
coated with a low-friction agent. Do not apply
grease to the lip.
• Check that the V-ring is installed with a
uniform stretch around the shaft.
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