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What is the effect of pitch error?

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What is the effect of pitch error?

(a) Increase effective diameter of bolt

(b) Decrease effective diameter of screw

(c) Increase effective diameter of nut

(d) Increase effective diameter of both nut and screw

This question was posed to me in an online interview.

I need to ask this question from Effect of Pitch Errors in portion Metrology of Screw Thread, Gauges for ISO Metric Screw Threads of Engineering Metrology

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The correct answer is (a) Increase effective diameter of bolt

Explanation: An error in pitch increases the effective diameter of a screw or bolts virtually and virtually decreases the effective diameter of a nut. The meaning of the virtual change is that if any screw is perfect except for pitch error, if its effective diameter is not reduced, it will not easily screwed into a perfect ring gauge of same nominal size.

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