Bell tap

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A cylindrical fishing tool having an upward-tapered inside surface provided with hardened threads. When slipped over the upper end of lost, cylindrical, downhole drilling equipment and turned, the threaded inside surface of the bell tap cuts into and grips the outside surface of the lost equipment. Also called bell; box bill; die; die collar; die nipple. See also: bell screw; screw bell; bell socket; outside tap. Long

Source: Dictionary of Mining, Mineral, and Related Terms

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