I think you may need the callipers out they all seem to be a touch more accurate that that, what chainset is it for ?
Though that's just ones on the web.
I cannot find mine at the moment, chainset I was going to raid doesn't have any as they're built in. Damn '89 SR cranks and & Suntour XC Comp MD '91 cranks. So I blame Sakae for not having one, lol
Only bolts I have are one 13mm and some 8mm (all steel)