Machine Design
Spring stiffness is

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

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Machine Design
Plastic flow in ductile materials

Depends on other considerations
Has no effect on it
Increases the seriousness of static loading stress concentration
Lessens the seriousness of static loading stress concentration

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Machine Design
A bolt of M 24 × 2 means that

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

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