Machine Design
A self locking screw has

Fine threads
Hole for inserting split pin
Course threads
Coefficient of friction is greater than tangent of load angle

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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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