Thread-cutting tap
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United States of America Patent
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Aug 22, 2017
Grant Date -
Mar 31, 2016
app pub date -
May 24, 2013
filing date -
May 24, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A thread-cutting tap includes: a thread portion having an external thread, and including a chamfered portion and a complete thread portion that is axially adjacent to the chamfered portion; a flute extending from an axially distal end of the tap toward an axially proximal end of the tap; a rake face defined by one of widthwise opposite end portions of the flute; and a cutting edge defined by one of widthwise opposite edges of the flute, so as to be adjacent to the rake face and extend along the flute. The cutting edge is provided with a protrusion portion at least in a radially outer end portion of the chamfered portion, such that the protrusion portion protrudes from the rake face forwardly in the rotation direction and extends along the cutting edge.
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