Timken Industrial Seal Catalog

Glossary
Width
Assembled Seal made up of a group of parts,
Seal: including sealing surface(s), provisions
for initial loading and a secondary
sealing mechanism to accommodate
radial movement required for installation
and operation.
Axial Gap between element heel and seal lip.
Clearance:
Back Lip Angle seen from the back of the seal
Angle: coinciding with the seal interface.
Bearing Product using labyrinth sealing methods
Isolator: and other techniques to provide highperformance
sealing technology for
demanding applications in operating
environments with high levels of
contamination.
Bonded Assembly in which the insert and/or
Seal: spring is bonded to the elastomer
sealing element.
Contact Interface where sealing element reacts
Point: with the shaft or bore housing.
Contact Line Axial distance from seal face to
Height: contact point.
Seal O.D. - Flare
Face of the Seal
Back of the Seal
Seal O.D. - Heel
Contact Amount of area reacting dynamically in
Width: the axial direction.
Dynamic Amount by which a shaft, at the sealing
Runout: surface, does not rotate around the
true center. Measured by holding a
dial indicator against the shaft surface
while it is slowly rotated. The resulting
measurement is called a total indicator
reading, or TIR.
Shaft
Front Lip Angle
Contact Point
Back Lip Angle
Hinge
Glossary
Elastomer: Synthetic and natural materials that
are able to be vulcanized and can be
elongated at least twice their original
length at room temperature, but are
able to return to their approximate
“normal” length when released.
Common material used in the
manufacture of seals.
End Play: Measurement of axial movement allowed,
in reference to the shaft on which the seal
lip comes into contact.
Face Lip Angle seen from the face of the seal
Angle: coinciding with the seal interface.
Fluid Side: 1.) Refers to face of the seal when
goal is to retain lubricant. 2.) Refers
to the back of the seal when goal is
to exclude contamination.
Garter Helically-coiled wire in the form of a
Spring: ring that helps maintain a radial sealing
force between the radial seal lip element
and a shaft or bore. A close wound
spring is used for tension and an open
wound is used for compression.
Heel: Part of lip seal case located tangent to
the back of the seal.
Hinge: Point at which the seal lip pivots around
the seal assembly.
Housing Cylindrical surface that mates with the
Bore: OD of a standard lip seal’s outer case
or an external lip seal’s contact lip.
Inclusion: Retaining lubricant by facing the seal in
toward the lubricant.
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