M1917 rear sight spring screw

[Potashminer]

Apologies if I should have been able to find this, but have not!! So asking for knowledge about the U.S. Model of 1917 rifle. As per Charles Stratton book, the little screw that anchors the flat spring under the rear sight - he lists it as 0.14" diameter and 37 threads per inch. He writes that the screws are identical for Pattern 1914 and U.S. Model of 1917 rifles. Does anyone know what series of threads that is from - to find a replacement??
I know the equipment used to make the Pattern 1914 and then the M1917 originally came from an arsenal near Enfield Locks in England. So, I suspect many of the threading standards were British - not sure if any were "converted" once in USA? So, not having any luck identifying what thread series a 0.14" diameter with 37 threads per inch would fit in to - I am assuming that was a "standard" thread series in Britain, but could possibly be unique to the Enfield arsenal as well??

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