Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

3/(3 + v)
4.5/(4.5 + v)
0.75/(0.75 + √v)
6/(6 + v)

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Machine Design
A bolt of M 24 × 2 means that

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

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