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The nut which has a cylindrical grooved collar at its lower end and this collar fits into a corresponding recess in the adjoining piece is named as.

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The nut which has a cylindrical grooved collar at its lower end and this collar fits into a corresponding recess in the adjoining piece is named as.

(a) Simmond’s locknut

(b) Grooved nut

(c) Castle nut

(d) Sawn nut or wiles nut

The question was posed to me in a job interview.

This is a very interesting question from Locking Arrangements for Nuts topic in chapter Screw Threads & Screwed Fastening of Engineering Drawing

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Correct choice is (b) Grooved nut

Explanation: Grooved nut is a nut which has a cylindrical grooved collar at its lower end and this collar fits into a corresponding recess in the adjoining piece. A set-screw is inserted through the nearest face of the piece. The dog-end of the set-screw enters the groove and prevents slackening of the nut.

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