Machine Design
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have

Left hand threads
Multiple threads
Pointed threads
Right hand threads

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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 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

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