The case of the of I didn't use a torque wrench and who the #3LL ever does when putting pan bolts on so chalk it up to "damn I hate when that happens and now I have to Helicoil them".
I use a torque wrench on them. I spent many hours repairing aluminum threads when I was in the Navy because hamfisted sailors reefed down on them.
And I can guarantee that you can rip out aluminum threads even if you have 8mm of thread engaged. Just keep tightening and it will happen. Now if it were steel on steel, or iron, you'd like snap the bolt, but not on aluminum.
