Your guess is way off. They break at closer to 95-100.

You actually can tell by feel or especially If you have a torque adapter showing the current torque. When I did the destructive testing after the third or fourth try you could turn the bolt more but the torque number never got higher.

When I did the testing I was trying to determine a torque number you could use vs. angle but it's not possible. The friction changes too much each attempt.

I did notice that for example it would start to yield about 90 N·m but the amount of angle would vary wildly. Then I would try another time and it would yield much lower torque.

You could probably get away with for example 80 N·m but 65+45 would likely get more repeatable clamping force

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)