How much more shear force can a V thread transmit compared to a square thread?

• A. 2x
• B. 5x
• C. 10x
• D. 15x

Answer: (C)

The reason the selection of 10x for the comparison between the shear force transmitted by a V thread and a square thread is correct lies in the geometry and loading characteristics of these thread types.

V threads, characterized by their angled sides, have a more effective load distribution along the thread flanks compared to the flat surfaces of square threads. This angled profile allows V threads to engage with greater contact area when loaded, which enhances their shear strength. The increased effective area means that V threads can typically handle much higher shear forces due to the inherent mechanical advantages of their shape.

In addition to the geometry, the efficiency of the V thread under load means that it can distribute forces in a manner that reduces the onset of failure points significantly better than a square thread. The 10x factor often cited reflects experimental data and practical observations that demonstrate how V threads outperform square threads under similar conditions.

As for the other options, they either underestimate or overestimate the performance difference based on traditional mechanical principles of thread designs. Therefore, focusing on the load characteristics and the geometry of the threads, it is established that V threads can transmit significantly more shear force compared to square threads, aligning with the 10x superiority indicated in the correct answer.