Machine Design
Machine screws are

Used to prevent relative motion between two parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Slotted for a screw driver and generally used with a nut

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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
Cross-sectional area of the threads is 24 mm²
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

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