Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.7 times
0.8 times
0.4 times
0.6 times

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Machine Design
Turn buckle has

Left hand threads on both ends
Right hand threads on bout ends
Left hand threads on one end and right hand threads on other end
No 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
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²
The nominal diameter of bolt is 24 mm and pitch is 2 mm

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