Machine Design
Spring stiffness is

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

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Machine Design
A bolt of M 24 × 2 means that

The pitch of the thread is 24 mm and depth is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
Cross-sectional area of the threads is 24 mm²
The nominal diameter of bolt is 24 mm and pitch is 2 mm

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