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Thread: Quick question about ISO tolerances (H7)

  1. #1
    Associate Engineer
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    Quick question about ISO tolerances (H7)

    Hello.
    I have this small issue.
    Will a 12 mm H7 hole fit with a 12 mm h7 shaft? To a degree where it is possible to mount by hand?
    Most places I see tolerances specified like H7/h6.

    Thank you beforehand

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
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    I assume you are referring ISO 286-1 & 2?

    H7 tolerance for hole is +0 / - 0,018 mm

    h7 tolerance for shaft is +0,018 / -0 mm

    Mount by hand? Probably not...

    What is the application?

  3. #3
    Associate Engineer
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    That's what I am reffering to.
    Yeah, I thought so.
    It is the shaft of a motor that has to fit into a pulley, unfortunately the tolerances are H7 and h7.

    Edit:
    I am also not interested in backlash of any kind, since I need to be able to control the setup with a precision of +/- 0,2 mm
    Last edited by repau; 05-14-2014 at 01:57 AM. Reason: Additional information

  4. #4
    Technical Fellow Kelly_Bramble's Avatar
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