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DT Swiss 340 so I think it's M10
Certainly isn't, DT hubs have fat axles and cartridge bearings. You can convert to 135×10 through axle and then use an M10 axle & track nuts instead of the DT 10mm RWS, or you could get your machinist to copy the 135×10 through axle but with a narrower bore and M10 tapped ends for bolts.
Not sure if this kit fits 340 but based on other axle compatibility I think it should.
Thanks. It's a DT Swiss 340 so I think it's M10.