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When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

\(\frac { WD } { n _{d^3} } \times K\)

\(\frac { 2 WD } { n _{d^3} } \times K\)

\(\frac { 4 WD } { n _{d^3} } \times K\)

\(\frac { 8 WD } { n _{d^3} } \times K\)

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