What is the primary advantage of using fine threads?

The primary advantage of using fine threads is that they provide a stronger hold in weaker materials. Fine threads have a greater number of threads per unit length, which increases the contact area with the material being fastened. This characteristic is particularly beneficial when working with softer or weaker materials, as the increased thread engagement helps distribute the load more evenly and reduces the likelihood of stripping the material.

While other options might have merit in different contexts—such as quick assembly or ease of manufacturing—fine threads specifically enhance the joint's strength and stability in applications where the material may not be able to withstand the forces applied to it. This is particularly relevant in industries such as automotive or aerospace, where materials are often lightweight and designed to be strong but may need extra security against failure.