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What is the thickness of washer when a nominal diameter of bolt is D?

What is the thickness of washer when a nominal diameter of bolt is D? Correct Answer 0.12D

Washer is a cylindrical piece of metal placed below the nut to provide smooth bearing surface. The thickness of washer when nominal diameter of the bolt is D is 0.12D and outer diameter is 2D+3 mm and inner diameter is D+0.5mm.

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