Machine Design
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)

(WD/ πd3) × K
(8WD/ πd3) × K
(2WD/ πd3) × K
(4WD/ πd3) × K

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.625 t for both the straps on the inside and outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for both the straps on the inside and outside

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