Machine Design
The buckling load will be maximum for a column, if

One end of the column is clamped and the other end is free
Both ends of the column are clamped
Both ends of the column are hinged
One end of the column is hinged and the other end is free

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Machine Design
Turn buckle has

Right hand threads on bout ends
Left hand threads on both ends
No threads
Left hand threads on one end and right hand threads on other end

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