Fast make-up fatigue resistant rotary shouldered connection
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United States of America Patent
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Aug 26, 2008
Grant Date -
Oct 5, 2006
app pub date -
Jan 29, 2004
filing date -
Jan 29, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A thread form having improved strength and fatigue resistance. The root of the thread is cut on multiple cutting radii having displaced centers. At least two of the root surfaces are formed by cutting radii having lengths that are greater than the root truncation. The threads are used in a double start configuration to increase the connection strength and reduce makeup and breakout rotations.
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