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Practical application of the right-hand, left-hand threads is made in a coupler-nut and turn-buckle.

(a) True

(b) False

This question was addressed to me at a job interview.

Question is from Screw Threads in portion Screw Threads & Screwed Fastening of Engineering Drawing

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Correct option is (a) True

To elaborate: The length of a tie-bar can be adjusted by this nut. Looking from right, if the nut is turned in clockwise direction, the ends of the rods will move closer to each other. They will move further apart when the nut is turned in an anticlockwise direction.

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