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

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

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Machine Design
A bolt

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Is provided with pointed threads
Has a head on one end and a nut fitted to the other

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