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Thread: Bearing fit

  1. #1

    Question Bearing fit

    If you make a spindle/axle for a bearing how tight should the fit be? Slide on our press fit? Say a 5/8 dia.

  2. #2
    Join Date
    Feb 2005
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    Default

    About .0001" to .0004" interference, depending on bearing design, journal surface finish, load, speed, lube, service factor.

  3. #3
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    Default

    what kind of bearing?
    Just got my head together
    now my body's falling apart

  4. #4
    Join Date
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    Default

    About .0001" to .0004" interference, depending on bearing design, journal surface finish, load, speed, lube, service factor.
    As well as expected service temperature range and the phase of the moon when installed.
    Free software for calculating bolt circles and similar: Click Here

  5. #5
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    Wink

    Moon phase is only relevant to phos bronze!
    Just got my head together
    now my body's falling apart

  6. #6

    Default Bearing fit

    This would be for a wheel bearing light duty use.

  7. #7
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    "wheel bearing light duty use"

    sorry Tim, you're gonna have to a lot more explicit if you want a meaningful answer.

    "light duty" for a garden wheelbarrow or
    "light duty" for an occasional run at Bonneville on a 1920 Indian Scout?

    Pardon me if I sound facetious, I've heard sillier questions asked by engineers.
    Just got my head together
    now my body's falling apart

  8. #8
    tattoomike68 Guest

    Default

    Quote Originally Posted by timh
    This would be for a wheel bearing light duty use.
    It its on a haul wagon that you pull behind a tractor then .001 clearance slide fit is fine. you wont need a hammer and chisle to change the bearing if it ever needs it.

    It may be a bit tighter if its on a boat trailer that goes down the road at 65 MPH.

  9. #9
    Join Date
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    If the spindle is stationary, as in an automobile front wheel bearing, The spindle should be loose sliding fit, and the OD should be a press fit.
    If the spindle turns, then it is opposite, with the spindle being a press fit, and the OD a sliding fit.
    Rich
    "Loose" is .0005 clearance
    "Press" is .0003 interferance

  10. #10
    Join Date
    Jun 2003
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    428

    Default More strictly speaking . . .

    The bearing race that rotates relative to the load should be tightly fitted, the bearing race that is stationary relative to the load should be slip-fitted.

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