When the nut diameter is D, what will be the approximate diameter of the washer?

When the nut diameter is D, what will be the approximate diameter of the washer? Correct Answer 2D+3mm

A washer is a cylindrical disc placed below the nut when the given nut diameter is D, then the diameter of the hole is approximately considered as 2D+3mm, and the diameter of the hole is taken as D+0.5mm.

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