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  1. rbgos

    API 7: IF vs. REG vs. FH Threads

    Just come across this thread - very useful, thanks! With all this talk of IF threads having worse fatigue resistance than NC, does anyone have the actual data in terms of SCF and what fatigue curve to use? I'm trying to do a fatigue analysis on some drill-pipe which has either 4.5"IF or NC50 -...

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