Industrial seal self study guide - SKF.com

Test, Life – A laboratory procedure used to
determine that period of operation which a
component or assembly will operate until it
no longer performs its intended function.
Through Bore – Bore without a diameter
reduction, may have a bearing in line with
a seal.
Tolerances – Bore and Seal – The bore and
seal tolerances.
Torque – The tendency of a force to produce
rotation about an axis.
Transverse Grinding – A shaft surface
finishing method of which there are two types;
either the grinding medium moves laterally
while the shaft turns, or the wheel rotates in
a fixed position while the shaft turns and
moves laterally.
Tumbled Stone Finishing – A shaft surface
finishing method in which a uniform shaft
appearance is produced.
Underlip – The area under the seal lip.
Unitized Seal – A seal assembly in which
all components necessary for accomplishing
the sealing function are retained in a single
package.
Variation, Radial Wall – The difference
between the minimum and maximum radial
wall dimensions when measured around 360
of the seal lip.
Vibration, Torsional – A vibration which has
a circumferential or angular direction. It is
often generated by a stick-slip action between
mating seal surfaces.
V-Ring Seal – A versatile all-rubber seal that
mounts directly on the shaft by hand and is
then sealed axially against a counterface,
housing bearing race or similar surface.
Functions by “slinger” or deflector action.
Vulcanizing – An irreversible heat and chemical
treatment process that makes rubber in a seal
more elastic and durable. Used to rejoint
V-rings that were split during installation.
“WasteWatcher” – An SKF program designed
to consolidate seal stocking units in relation
to their applications to control replacement
inventory and effect cost savings for the user.
Waveseal – The SKF Waveseal is a smooth
lip, bi-rotational hydrodynamic radial lip seal.
A shaft seal that pumps lubricant back in the
sump while sealing out contaminants – no
matter which way the shaft is turning.
Wear Sleeve – A replaceable metal ring.
Generally used in assemblies to eliminate
expensive shaft replacement caused by
grooving that may occur at the seal shaft
interface.
Width – See Seal Width.
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