NCCER Millwright Practice Exam

Question: 1 / 400

What is the name of the tool used to cut external threads on a bolt or rod?

Die

The tool used to cut external threads on a bolt or rod is known as a die. A die is a cylindrical tool with a hole that has threads cut into the interior surface, allowing it to produce external threads when turned onto the bolt or rod. It is specifically designed for this purpose and provides a clean, precise thread form, critical for ensuring proper fit and function in mechanical applications.

In contrast, a tap is designed for creating internal threads in a pre-drilled hole, allowing for the insertion of bolts or screws. A router, on the other hand, is used primarily in woodworking for hollowing out an area in a hard material, not for threading. Lastly, a blade generally refers to a cutting edge on tools like saws or knives and does not serve the purpose of threading bolts or rods. Thus, the die is the correct tool for cutting external threads.

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Tap

Router

Blade

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