I reuse the 10mm CV bolts all the time. I put Schnorr washers on them.
I don't reuse the 8mm ones. I've seen a several loose 8mm CV bolts and I think it happened to me once or twice. My solution is to use new ones. I don't know if it is the grease in the threads (of the old bolts) or what but it solved the problem for me. These bolts are relatively inexpensive so it's cheap insurance.

Do all M8 bolts have the same thread pitch?

Yes

Thank you. All of mine are loose. I suspect they were over torqued in the past, rendering them over stretched.

No! For the CV joints you want to make sure you get M8 with 1.25mm pitch. The most common alternate pitch is 1.0mm.

That’s one possibility….

Which class of bolt is acceptable for cv joints? And, are the moon washers reusable. Mine “ look okay “?
I’m seeing 8.8 zinc, nothing higher for zinc. Black Oxide 12.9, prone to rust!

12.9 - black oxide is typical and not a problem.

Moon washers are certainly reusable.

Yes Sir. & thanks

most times when they come loose it is because of sloppy assembly and they have CV grease in the threads,,
the very last thing when doing this job is taking each bolt back out one at a time and installing new bolts, or cleaning the old ones with brake clean and an old tooth brush and putting a dab of blue loctite.

recheck after 500 miles, 1k miles and 5 k miles ... good to go ..

i also run a pipe cleaner type wire brush through the holes, but not everyone has one.

This is interesting. And lends to what I suspected. I’m in the middle of this job on my 930. My 10mm bolts had washers on the inside only. And I don’t think the were Shnorr washers. This is the first time the C/V joints have been off in over 15 years. They were all tight. After reading all the threads I got nervous and ordered
Nord-Locks. I’m still waiting on them. The problem is, I’ll need longer bolts for proper thread engagement because the Nord-Locks are over 2mm. longer
I think I’ll just run wut I brung

This is a good point. And should be done to achieve proper torque specs. Regardless of weather or not you’re using Locktite.