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

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

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Machine Design
Spring stiffness is

Load required to produce unit deflection
Its ability to absorb shocks
Its capability of storing energy
Ratio of coil diameter to wire diameter

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