Starting in 2018 all manufactures of medical luers are required to measure the luer thread dimensions following the ISO 80369-7 standard. The current manufacturing method of the inner thread uses core pins in the mold. The angular orientation of those core pins is no constraint to the angular orientation of the overall part, therefore any cross section of the thread profile will most likely not be oriented to one of the key dimensions of the ISO standard, the first full thread.
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