Intro to Millwright Practice Exam

What file type is best for cleaning slightly damaged threads?

1. Rasps

2. Flat Files

3. Thread Files

4. Half-Round Files

The correct answer is: Thread Files

Thread files are specifically designed for cleaning and repairing thread damage on screws, bolts, and other fasteners. They have a unique shape that allows them to match the profile of different thread types, making them effective at restoring the original geometry of the threads. The teeth on a thread file are crafted to engage with the damaged threads in a way that removes burrs and imperfections without altering the overall dimensions too much. This specialized design is what makes thread files superior for this task compared to other types of files. While rasps, flat files, and half-round files are useful for general shaping, smoothing, and finishing of surfaces, they do not possess the precise structure necessary for accurately cleaning or repairing threads. Using them on threads can lead to further damage or an improper fit, which is why thread files are the recommended choice for cleaning slightly damaged threads.