You are correct Grenadier1758 - they are metric. They are either an 8 mm or a 9mm diameter but I don't know the pitch. I was going to make up some myself but then I did not want to spend the money for a die that will be used for only a few times - not worth my time or money as I have other flasks & spouts. :vGrenadier1758 said:I believe that the threads are metric. You want the 10 x 1.0. (This is very close to 3/8 x24.)
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