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ASVAB · Hand Tools

What is the purpose of a tap and die set?

Correct answer

Cutting threads — taps cut internal threads (inside a hole), dies cut external threads (on a rod or bolt)

  1. A Measuring temperature and pressure
  2. B Cutting threads — taps cut internal threads (inside a hole), dies cut external threads (on a rod or bolt)
  3. C Cutting sheet metal
  4. D Driving fasteners

Why this is the answer

TAP: A cutting tool that creates internal (female) threads inside a drilled hole — used to create a threaded hole that accepts a bolt. DIE: A cutting tool that creates external (male) threads on a round rod or bolt blank — used to create or repair external threads. Together, a tap and die set allows a machinist or mechanic to: create new threaded holes in metal; repair damaged threads; and create custom threaded fasteners. Common use: re-threading a stripped bolt hole.
Source: ASVAB SI, Threading Tools

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