Industrial shaft seals

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Radial
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Fig 39
Type 1
Type 2
Type 3
SKF radial shaft seals are produced in different
designs, variants and sizes. The designs differ
in the form and execution of the outside
diameter and the sealing lip.
Outside diameter design
The standard range of small radial shaft seals
produced by SKF covers five different outside
diameter executions. These are Types 1, 2 and
3 to ISO 6194/1 (Forms A, B and C to DIN
3760 and DIN 3761, Part 2) (fig 39).
Radial shaft seals with an elastomeric
outside diameter, Type 1 and Type 4 (Forms A
and AS) have a particularly wide range of
application. They allow a tight fit in the housing
bore when the housing material has a higher
coefficient of thermal expansion than steel
and/or when the housing is split. They are also
recommended in all cases where the requisite
tolerances for the housing bore, e.g. for the
surface roughness, cannot be achieved.
Radial shaft seals with metallic outside
diameter (shell), Type 2 (Form B), are
multipurpose seals which can be used for most
applications. They are relatively easy to install
and, provided housing bore meets the accuracy
reqirements, they will fit tightly and centrically
in the bore.
The radial shaft seals with metallic shell and
secondary reinforcement in the side face, Type
3 (Form C), offer advantages where operating
conditions are difficult and/or rough. They have
higher radial stiffness than Type 2 and are
available for shaft diameters of approximately
50 mm and above.
As the static sealing effect between the
metallic shell and the housing bore is
somewhat limited, particularly against thin
fluids and media which can “creep”, most SKF
seals with metallic shell are coated with “Bore-
Tite”, a water-based paint-like sealant, see
page 26.
Besides the three standardized designs
already described, SKF also produces large
seals, where the outside diameter is specially
designed to meet the requirements for large
diameter applications. See page 198.
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