Thread-forming tap
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United States of America Patent
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Oct 31, 2017
Grant Date -
Jun 11, 2015
app pub date -
Jun 22, 2012
filing date -
Jun 22, 2012
priority date (Note) -
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Abstract
A thread forming tap includes a screw thread formed into a male thread shape with margin portions disposed to project in radial direction and relief portions having a diameter smaller than the margin portions, the margin portions and relief portions alternatively arranged and, thread forming tap causes the margin portions of the screw thread to cut into a surface layer portion of a prepared hole formed in a work to plastically deform the surface layer portion to form a female thread, margin portions are formed into a ridge line shape with a width dimension of zero at least at a thread bottom of the screw thread, and margin portions are formed into a ridge line shape with a width dimension of zero in a range from a thread bottom of the screw thread to a position between the thread bottom and an effective diameter position of the screw thread.
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