The Acme screw thread is especially useful because of its:

The Acme screw thread is particularly beneficial due to its sloped sides, which enable smooth movement while engaging. This design allows for efficient conversion of rotary motion into linear motion, making it effective in applications where a sliding mechanism is required, such as in vises, lead screws, and some types of machinery.

The sloped design reduces friction and wear over time, promoting durability and longevity in direct mechanical applications. By having these angled sides, the thread is less likely to jam compared to other thread profiles, facilitating easier movement and operation. This feature is critical in many engineering and manufacturing environments where precision and reliability are paramount, as it allows the mechanisms to function without excessively high operating forces, leading to overall smoother interactions.

Other features, such as a uniform square profile or high friction, do not offer the same advantages for smooth engagement, while compact fitting in restricted spaces isn't a distinctive trait of Acme threads relative to their functionality. Thus, the angled sides play a crucial role in their effectiveness.