They are 150x12mm sorry can't remember the thread pitch, I use a steel bolt in my Corsair frame, it's so heavy you can't notice a difference. My Nicolai came with a really well made bolt that has a relief between the thread and the plain shank which is needed on an alloy bolt. I think Superstar or someone similar made one.
FTW had some aluminum axles made for his FB-10's. They were originally set up for Maxles, so they're the same thread pitch and 150X12. Maybe contact him to see if he has any more?
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