Stripped socket for timing chain cover bolt

1.25 is the thread pitch. Looking at it, it doesn’t look like fine thread so if it says 8mm 1.25 it’s probably the correct kit. The only way to be certain would be to gauge the threads.

 

1.25 is the thread pitch basically the angle of climb of the spiral.

Fine thread is 1.00 and coarse thread is 1.5 1.25 is medium, just a metric for metric bolts.

Also it's not a socket that's stripped I keep thinking you rounded the head off or got a 12 point socket stuck, what you have is a stripped threaded blind hole in your block.

Not going to lie it kind of impressive to me you took on such level of maintenance on your vehicle and even have a digital caliper without general knowledge of this sort of thing. It's like you skipped a year of mechanics school or something.



Not trying to be mean at all, honestly impressed and I wish you luck, just find your skill to knowledge level to be conflicting.

 

When I say "socket" I mean the hole the bolt goes in. I tried both bolts in both holes and it's definitely the hole that's stripped, not the bolt.

 

Right, that's called an (internally) threaded blind hole.

A hole goes completely through something, a blind hole goes partway through but has a back stop. A unthreaded hole would take something like a dowel for hardware as apposed to a threaded hole which requires a threaded fastener.