Why are Acme screw threads preferred in many mechanical applications?

Acme screw threads are particularly favored in mechanical applications primarily because they allow for efficient movement while engaging. This feature is due to their trapezoidal shape, which provides a larger surface area for contact compared to standard square or round threads. The shape contributes to a smoother engagement and disengagement of the threads, enabling easier and quicker movement of components.

Additionally, the design of Acme threads allows for greater load-bearing capacity, which is essential in applications where screws are subjected to significant forces. The engagement also reduces the risk of cross-threading, making them more reliable in dynamic situations.

In contrast, while the other choices mention aspects like minimizing friction, precision, and ease of manufacturing, these are secondary benefits or not as defining characteristics of Acme threads. Their primary advantage lies in the efficient movement, making them suitable for applications such as lead screws in machinery where smooth operation is crucial.