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How is a blind drilled hole of 15mm diameter and 15mm deep dimensioned?

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How is a blind drilled hole of 15mm diameter and 15mm deep dimensioned?

(a) M15, DEEP 15

(b) φ15, DEEP 15

(c) φ15

(d) φ15 x 15

The question was asked in semester exam.

I want to ask this question from Basic Principles in Dimensioning in chapter Lines, Lettering and Dimensioning of Engineering Drawing

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Right choice is (b) φ15, DEEP 15

The best explanation: Since the hole is not through, it is mandatory to mention the depth of the hole while dimensioning. Hence a blind drilled hole of 15mm diameter and 15mm deep is dimensioned as φ15, DEEP 15. Since the hole is not threaded ‘M’ should not be used for dimensioning.

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