Machine Design
A key way lowers

The rigidity of the shaft
Both the strength and rigidity of the shaft
The ductility of the shaft
The strength of the shaft

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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 pitch of the thread is 24 mm and depth is 2 mm
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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