Intro to Millwright Practice Exam 2025 – Comprehensive All-In-One Guide for Exam Success!

The tool specifically meant for creating or repairing external threads is the die. A die is a specialized cutting tool that is used to cut external threads onto cylindrical objects, such as bolts or rods. It typically has a specific thread pitch and diameter engraved on its surface, which correlates to the size of the threads required.

When using a die, the operator will often use a die holder to ensure that the cutting action is applied evenly, allowing for the production of precise threads. As the die is rotated around the object, it removes material to form the threads, making it an essential tool in various machining and mechanical applications.

In contrast, a tap is used to create internal threads within a hole, and it serves a different purpose altogether. A saw is primarily designed for cutting materials and doesn't have any threading capability, while a file is used for shaping or smoothing surfaces and does not cut threads at all. This distinction clarifies why the die is the correct answer regarding tools for external threading.