Sorry I've loooked everywhere for this answer but have found little bit tables of strange code. I heard they were thicker then arrows, but then that may be an optical illusion with them being shorter.

What is the nominal diametre of a crossbow bolt (both ID & OD?) What wall thickness is carbon fibre bolts? Yeh it might vary by manufacturer but the measurements of the popular name brand would be a big help.

I have 8mm ID CF tube and am wondering if nocks and broadhead adaptors can be bought to fit.