Machine Design
A bolt of M 24 × 2 means that

The nominal diameter of bolt is 24 mm and pitch is 2 mm
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 pitch of the thread is 24 mm and depth is 2 mm

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Machine Design
Turn buckle has

No threads
Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends
Left hand threads on both ends

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