🔍 Key Concepts

• Internal vs. external threads – which side of the material are you cutting? • Common shop tools: tap, die, chaser, broach – what each one normally does • How new threads are created versus how damaged threads are cleaned up

💭 Think About

• Think about which tool is used to cut threads on the outside of a rod or bolt, not on the inside of a hole. • Ask yourself: which tool is most often used to create brand‑new threads, and which is usually used to restore or clean existing ones? • Match each choice to its usual job in a machine shop: which cuts internal threads, which cuts external threads, which reshapes, and which is for a different machining operation altogether?

✅ Before You Answer

• Be clear on the difference between internal (inside a hole) and external (outside of a shaft/bolt) threads. • Verify which option is commonly paired with a tap as its “opposite” for threading work. • Eliminate any tools that are mainly used for resharpening, cleaning, or shaping slots/holes, not for cutting brand‑new external threads.