Machine Design
Slenderness ratio is the ratio of

Width of column to depth of column
Effective length of column to width of column
Effective length of column to least radius of gyration of the column
Maximum size of column to minimum size of column

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Machine Design
A bolt

Is provided with pointed threads
Has both the ends threaded
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

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