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Cold Rolling Of API Connections

Cold Rolling Of API Connections

Cold Rolling Of API Connections

(OP)
Can anyone explain the benefit of cold rolling of API connections?

The method of cold rolling is, I beleive, to form a compressive layer to the root of the thread using a roller, this roller only touches the root of the thread, not the flanks.

Why does the root get treated? when only the flanks have any contact, attached is a full scale sketch of a NC50 connection drawn to Drilco spec. and clearly shows that there is no contact at the roots of both Pin & Box

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