Machine Design
A bolt

Has a head on one end and a nut fitted to the other
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Is provided with pointed threads

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards right of the bearing making metal to metal contact
Move towards left of the bearing making metal to metal contact
Have contact at the bottom most of the bearing

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