Hi,

I don’t have any of my calipers available to research your question but a bolts body of that 10mm diameter does seem a bit small for a front caliper application.

If you have the other side of calipers take one of those out and match it up by laying the thread pitches together side by side to match.

FYI
A lot of stores have thread sample testers and carry grade 5 bolts or higher, if needed.
I believe 10.9 is our grade 5
Most stores stop at 8 or five marks and are there for a farming tractors implements.
Most bolts on cars are a grade 5 and will have 3 line markers raised on the heads top face.
Grade 2 has no markers and are like butter in strength but that’s standard hardware.
Higher grades will have three or more lines, so the number two is a “given” and is a cheap way out of not having to strike the head. It saves cost and allows more room for identification purposes on other bolts.

From my experiences,
If you see a bolt head with line’s enough to go all the way around in a circle, now you are talking about special grade bolts!
They can even come with trace certificates back to a batch of manufacturing specialty.
NASA. Military, and highly sophisticated projects! Big DOLLARS!

Phil