Machine Design
A connecting rod should be

Strong in buckling about Y-axis
Any one of the above
Strong in buckling about X-axis
Equally strong in buckling about X-axis and Y-axis

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Machine Design
A bolt

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

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