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The
optimal surface
finish for the bore largely
depends on the type of shaft
seal in use. Generally speaking, seals with
a rubber-covered O.D. can
handle a rougher surface finish than metal O.D.
seals, but a surface that’s too rough may
damage the O.D. or prevent formation of a tight
static seal. On the other hand, a surface that’s
too smooth may make it more difficult for a seal
with a rubber-covered O.D. to stay in place. While
there is no accepted standard for minimum bore
roughness, we recommend a roughness of at least
2.03 µm (80 µin) Ra.
If the bore exceeds 2.54 µm (100 µin)
Ra, then a rubber O.D. seal or use of O.D. sealant
is recommended. Bore roughness should
never exceed 3.175 µm (125 µin) Ra.
THE
BORE MAIN PAGE
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“Good
design doesn’t stop with the shaft seal
and the shaft. Due consideration must also
be given to the housing bore.”
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