what is the differene between H8 and H7 i tolerances?

[omidomidi]

Hi, I wanted to know what is the difference between H8 and H7 in tolerances. when shall we use H7 and when H8?

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[thaidavid40]

Your question seems woefully incomplete. To what are you applying the tolerances, and under what uses or conditions? A fuller explanation of your question would help immeasurably.

Thaidavid

 

[Tmoose]

H7 and H8 are shown pictorially in the attached image from NTN bearing catalog.

Like thaidavid40 said, there should be more info based thought behind the decision.