Machine Design
According to Indian standard specifications, a Grey cast iron designated by 'FG 200' means that the

Minimum tensile strength is 200 N/mm²
Maximum compressive strength is 200 N/mm²
Maximum shear strength is 200 N/mm²
Carbon content is 2%

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Machine Design
Spring index is

Indication of quality of spring
Ratio of coil diameter to wire diameter
Its capability of storing energy
Load required to produce unit deflection

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Machine Design
Coaxing is the procedure of increasing

Fatigue limit by over-stressing the metal by successively increasing loadings
Metal hardness by surface treatment
Metal strength by cycling
Metal resistance to corrosion by coating

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