Nut, female thread machining device and female thread machining method
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United States of America Patent
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Apr 16, 2013
Grant Date -
Mar 4, 2010
app pub date -
Aug 25, 2009
filing date -
Aug 27, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
There is provided a nut having a thread portion having a female thread, a metallic plate portion having a base segment, and a hardness gradient portion provided between the thread portion and the metallic plate portion. The thread portion, metallic plate portion and the hardness gradient portion are monolithic each other, a metallographic structure of the metallic plate portion differs from a metallographic structure of the thread portion and a hardness of the hardness gradient portion is lower than a hardness of the thread portion and lowers from the thread portion toward the metallic plate portion.
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