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Thread plug gauges are used to check :

  • A.External thread
  • B.Internal thread
  • C.Shaft
  • D.Hole

Answer: B

Thread plug gauges check an internal thread.

A thread plug gauge is screwed into a tapped hole or nut. Its GO end must screw in fully and its NO GO end must not enter more than about two turns, which confirms the internal thread is within limits.

External threads are checked with thread ring gauges or thread caliper gauges. Plain plug gauges check plain holes, and plain ring or snap gauges check shafts; neither checks a thread.

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