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Which bolt is used as an appliance for lifting heavy machines?

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Which bolt is used as an appliance for lifting heavy machines?

(a) Hook bolt

(b) Eye-bolt

(c) Lifting eye-bolt

(d) Cup-headed bolt

I had been asked this question by my college director while I was bunking the class.

The query is from Bolts in division Screw Threads & Screwed Fastening of Engineering Drawing

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The correct answer is (c) Lifting eye-bolt

The explanation is: Lifting eye-bolt is used as an appliance for lifting heavy machines. It is screwed inside a threaded hole on the top of the machine, directly above its centre of gravity. The hook bolt is used when it is not possible to drill a hole in the piece adjoining the bolt-head.

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