If two cap screws of the same material have an equivalent stiffness of threaded portion and first cap screw-threaded portion has a cross-sectional area twice of second cap screw-threaded portion. Then find the relationship between their threaded portion lengths (where k = stiffness, A = cross the sectional area, E = young's modulus, L= length, axial load = P. All for threaded portion of cap screw):