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How is tapped hole of diameter 10mm with 20mm dimensioned?

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How is tapped hole of diameter 10mm with 20mm dimensioned?

(a) M10

(b) M10, 20

(c) M10, DEEP 20

(d) M10 20 mm deep

The question was asked in a job interview.

My question is from Basic Principles in Dimensioning topic in chapter Lines, Lettering and Dimensioning of Engineering Drawing

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The correct choice is (c) M10, DEEP 20

For explanation: A tapped hole of 10mm diameter and 20mm deep is dimensioned as M10, DEEP 20. The ‘M’ stands for metric threads. These are standard threads whose pitch is predefined according to the diameter. The ‘M’ indicates that the hole is tapped.

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