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Japan (where Dia Compe are HQ'd) has used the metric system for over a hundred years. You are looking for an M6 x 15mm black oxide socket head screw and nut. Thread pitch doesn't matter as long as they are both the same! A 5mm allen key will fit just fine. I have seen a lot of Japanese parts here in the US that have had Imperial/Standard parts etc forced onto them! Metric parts aren't easy to find here.