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What is the name of the nut which is a hexagonal nut provided with a cylindrical cap?

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What is the name of the nut which is a hexagonal nut provided with a cylindrical cap?

(a) Dome nut

(b) Wing nut

(c) Flanged nut

(d) Cap nut

This question was posed to me in a national level competition.

My enquiry is from Nut and Washers in chapter Screw Threads & Screwed Fastening of Engineering Drawing

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Best answer
The correct option is (d) Cap nut

The best I can explain: Cap nut is a hexagonal nut provided with a cylindrical cap at the top to protect the end of the bolt from corrosion. It also prevents leakage through the threads. Flanged nut is hexagonal nut with a washer that is a flat circular disc attached to it.

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