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Which of the following grade of a hole is mostly used for non-circular fits?

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Which of the following grade of a hole is mostly used for non-circular fits?

(a) H5

(b) H6

(c) H7

(d) H9

The question was asked during an online exam.

I'd like to ask this question from Guide for Selection of Fits in section Limits, Fits and Gauges of Engineering Metrology

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Correct option is (d) H9

To explain: H9, H5, H6, H7 these all are the grades of a hole. H9 can be obtained by reaming and boring. It is used for non-circular fits. H5 can be obtained by honing or internal grinding. H7 can be produced by broaching and grinding.

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