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Lock-nut or check-nut is chamfered on ___________

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Lock-nut or check-nut is chamfered on ___________

(a) upper side

(b) lower side

(c) both sides

(d) none sides

This question was addressed to me during an online exam.

I need to ask this question from Locking Arrangements for Nuts topic in portion Screw Threads & Screwed Fastening of Engineering Drawing

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Best answer
Right answer is (c) both sides

The explanation is: The lock nut is used along with an ordinary nut. The thread in lock nut presses against the bottom side of the thread in the bolt. When ordinary nut is held by spanner, while the lock is turned backwards with another spanner the two nuts are thus locked tightly against each other.

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