Screw and screw fastening structure
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United States of America Patent
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Jul 12, 2011
Grant Date -
Nov 26, 2009
app pub date -
Jun 12, 2006
filing date -
Jun 13, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a screw treated by a chemical conversion coating of trivalent chromium having a torque characteristic approximately equivalent to a screw of a hexavalent chromate treatment. For the purpose, on a surface of a bolt, a zinc plating layer is formed by a zinc plating treatment. On the layer, a chemical conversion coating of trivalent chromium is also formed by a treatment of chemical conversion coatings of trivalent chromium. The coating is formed to be thin and soft so that the zinc-based plating layer can be exposed on the surface due to rubbing off of the chemical conversion coating of trivalent chromium at a contact portion to a fastened member of the bolt by tightening the bolt.
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