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

2005-11-09

2008-11-25

Hewitt, James M (Department: 3679)

Pipe joints or couplings

Particular interface

Tapered

C285S334000, C285S390000

Reexamination Certificate

active

07455329

ABSTRACT:
A thread form having improved strength and fatigue resistance. The root of the thread may be cut on multiple cutting radii having displaced centers. At least two of the root surfaces formed by cutting radii may have lengths that are greater than the root truncation. The threads may be used in a double start configuration to increase the connection strength and reduce makeup and breakout rotations.

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