What are Acme threads known for?

Acme threads are known for their trapezoidal shape, which features a specific 29° angle. This design is particularly advantageous for applications that require durability and efficiency in motion. The trapezoidal form allows for increased surface area during contact, which enhances strength and load-carrying capacity compared to other thread types.

This geometry also facilitates smoother movement and less wear than sharper thread profiles, making Acme threads suitable for applications involving heavy loads or where a high degree of precision is necessary, such as in lead screws for machinery. Their characteristics align well with the requirements for power transmission in various mechanical systems, which is why option B accurately describes what makes Acme threads distinguished within the field of mechanical engineering.