Machine Design
Resistance to fatigue of a material is measured by

Elastic limit
Coefficient of elasticity
Young's modulus
Endurance limit

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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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Machine Design
In cross or regular lay ropes

Direction of twist of wires and strands are same
Wires are not twisted
Direction of twist of wires in strands is opposite to the direction of twist of strands
Wires in two adjacent strands are twisted in opposite direction

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