NCCER Millwright Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Study for the NCCER Millwright Exam. Empower your knowledge with quizzes that enhance understanding, and multiple-choice questions that provide hints and explanations. Get fully prepared and ace your exam!

Practice this question and more.

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

Die
Tap
Router
Blade

The correct answer is: 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.