Fast make-up fatigue resistant rotary shouldered connection

Details Fast make-up fatigue resistant rotary shouldered connection Fast make-up fatigue resistant rotary shouldered connection

2004-01-29

2008-08-26

Saether, Flemming (Department: 3677)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Thread or shank structure

C285S334000

Reexamination Certificate

active

07416374

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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patent: 6729658 (2004-05-01), Verdillon
patent: 6848724 (2005-02-01), Kessler

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