Screw and screw fastening structure

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure

Reexamination Certificate

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Details

C411S914000

Reexamination Certificate

active

07976258

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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patent: 2002/0127083 (2002-09-01), Ando et al.
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patent: 2003/0207133 (2003-11-01), Preikschat et al.
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patent: 2000-252042 (2002-09-01), None
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patent: 96/14514 (1996-05-01), None
patent: 00/44557 (2000-08-01), None

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