What is the tool used to create external threads on a pipe?

• A. Tap
• B. File
• C. Wrench
• D. Die

Answer: (D)

External threading on a pipe is produced with a die. A die is a threading tool with cutting edges that form the male threads as you rotate it around the outside of the pipe end, typically held in a die stock. It’s built for external threads, which is why it’s the right tool here. Tap, by contrast, creates internal threads inside a hole. A file can shape material but won’t produce precise, consistent threads. A wrench is used to turn fasteners, not to cut threads. For pipe work, a die (often used with proper lubrication) gives clean, standard external threads that fittings can screw onto.