Machine Design
The permissible stress for carbon steel under static loading is generally taken as

7500-10,000 kg/cm²
2000-3000 kg/m²
3000-4000 kg/cm²
4000-4500 kg/cm²

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of bending stress and curvature of the wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of transverse shear stress and curvature of wire

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