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For background discussion on this topic see the earlier section on column buckling. link

Column buckling calculation
Exceeding the recommended maximum compression force may result in buckling of the screw shaft.
Fc = Critical buckling force [lbs.]
dr = Root diameter [in]
L = Maximum unsupported length [in]
Cs = End fixity factor.  See table below.

It is recommended to operate below 80% of the screw critical buckling force.

End fixity factor - column buckling

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