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What is the outer diameter of washer when a nominal diameter of bolt is 5 mm?

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What is the outer diameter of washer when a nominal diameter of bolt is 5 mm?

(a) 13 mm

(b) 15 mm

(c) 10 mm

(d) 12 mm

I have been asked this question at a job interview.

Enquiry is from Nut and Washers in section Screw Threads & Screwed Fastening of Engineering Drawing

1 Answer

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Right answer is (a) 13 mm

To elaborate: When nominal diameter of bolt is D the thickness of the washer is 0.12D and outer diameter is 2D+3 mm and inner diameter is D+0.5mm. Here D is 5 mm so 2D+3 mm = 2 x 5+3= 10+3 = 13 mm.

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