What does the fit designation h7r6 represent?

1 Answers
MiaFitz
07/30/25 2:09am
h7/r6 is an interference fit. In the mechanical industry, any fit marked with H7/r6 refers to a fit under the condition of the same nominal size, and H7/r6 is always an interference fit. Definition of transition fit: Transition fit refers to a fit that may result in either interference or clearance. Therefore, regardless of the actual dimensions, as long as the h7/r6 fit is selected, whether the tolerance zones overlap or not, it is considered a transition fit. Relevant regulations: When the hole is taken as the reference, H7 is the reference hole with a tolerance grade of 7, and h6 is the shaft with a clearance fit of grade 6 accuracy. When the shaft is taken as the reference, h6 is the reference shaft with a tolerance grade of 6, and H7 is the hole with a clearance fit of grade 7 accuracy.
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