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They are 5,2 - 5,3 mm in diameter and something like 0,68 - 0,69 pitch
In imperial that would be 7/32" × 36tpi, which isn't anything normal but would be easy to make on an imperial screw machine. I'm just surprised that they didn't go metric, even if you wanted to be difficult I'd have thought M6×0.75 would be a more likely choice in a bike factory as you already have 0.75 pitch set up for chainring bolts 🙂
gbj_tester
I think I've got the same BBB seatpost as @mespilus.
Or at least a model that uses the same size bolts.
I've also been looking for some replacement bolts as the current ones don't look that great...
Anyway, they really are some weird size that's not quite M5.
They are 5,2 - 5,3 mm in diameter and something like 0,68 - 0,69 pitch. Pictures below.
I guess these are proprietary bolts? Why would the manufacturer not use standard bolts?