Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Completely reversed loading
Dynamic loading
Combined static and dynamic loading
Static loading

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Machine Design
A bolt of M 24 × 2 means that

Cross-sectional area of the threads is 24 mm²
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

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