SCREW FASTENER
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United States of America Patent
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N/A
Issued Date -
Dec 3, 2009
app pub date -
May 22, 2008
filing date -
May 25, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This invention provides a bolt having threads that performs anti-loosening function and that maintains a specified thread strength, a bolt that also enables manufacturing costs to be reduced. The thread of the step lock bolt is constructed so to include a play side flank formed having a specified lead angle and a pressure side flank formed into a step like configuration, in which a flat portion whose lead angle is 0 (zero) and an inclined portion whose lead angle is steep alternate continuously.
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