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pinned coupling

A drill-rod coupling that has been permanently attached to the body of the rod by a metal dowel (or pin) driven into a small hole drilled at the point in the rod where the coupling is screwed into the body of the rod.

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Penulis

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 poin
  • 100% positive feedback
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