Take the broken bolt, or a matching one, to a Fastenal or Brafasco? They might have something.
That does seem like a very specific bolt though...
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... if I read this right; you have a shouldered bolt with a 10mm shaft, that necks down to a M6 thread?
That would be a dealer item, ONLY available at a dealer. It's an OEM part.
is it the bolt to hold the caliper on? A 6mm to hold a caliper doesn't sound right to me....but if that is so,
Take a 6mm bolt and add a 10mm OD sleeve.
Only half of your screen shot shows up, what bike is this for?
What are you measuring that is M10? The smooth shaft of the bolt, or the size of the head? M10 or M6 refer to the dimensions of the threaded portion. The size of the head isn't really important (you can use a washer if you can't find a flanged bolt), and the size of the wrench you use is irrelevant.
Yeah, it's just an M10 bolt with a smooth section, there's no M6 portion. Your calipers just can't measure the inside of the threaded female hole accurately. If you want to be sure, take it to Home Depot and use their little nut/bolt sizer thing in the hardware aisle.
No look at this hole, it's definitely not M10
FYI, this is the one from my wife's bike
If you stuck a caliper into a threaded hole to measure it, you measured the "lesser" diameter, the diameter at the BOTTOM or root of the thread of the bolt.and then the diameter of the hole on the end it threads into