Originally Posted by andrewwynn

Also somewhere in the middle. If the bolt is plastic deformed from the initial install, it will have a smaller cross section and the next time it's installed using the same procedure it will logically have a lower clamp force that's the entire explanation for single use.

That said it might be higher than proof load but be less than yield so there is no deformation but it's stressed past proof load so NASA can't reuse the bolt, but DIY on BMW yes sure.

Back to the original thought: people are ONLY GUESSING because nobody took the time to take a friggin bolt or two and measure what happens.

It will be laughable if the TTA ends up being less than the normal spec of how much torque to apply to a 10mm bolt.

The debate isn't pointless it preps the mind and mindset for doing some appropriate texts/experiments that can finally answer the question.

If for example TTA process ends up at 65 N·m than BMW are aholes to tell people to replace a bolt that wasn't even pushed to proof.

If the bolt ends up BENT due to sideways loading, that could be another good reason to switch out the bolt.

One way or another I will using a reusable solution in the future. The results of my tests will be shared so finally people can have measured values to use as well to make an educated determination rather than take one of the extreme sides must replace "because it says" or it can't really need it (with absolutely NOTHING to back that up).

My 3/8 bolt (5500# clamp force) for months holding my plate on will be solid proof one way or the other. If there is no side slip evidence on my plate it's absolutely proof positive the M10 torqued past proof is waaaaay more than needed

If the plate has a oval hole worn in because I'm a moron that will be solid evidence that it needs closer to design spec. I'm kinda hoping that there will be clear evidence of motion of the plate. I drive over curbs a lot. If I didn't ditch witch my car into slipping the plate nobody else will.

I've been wanting to follow through with this test ever since I put the temporary 3/8 bolts in. (I didn't want to put the original bolts through more stress since I took them in and out a few times in a week (removed plate to clean engine, put back bolts in to hold sway bar, removed those to reinstall plate, removed again to take plate out to install new oil absorber aka sound insulation then install once more).

I was being lazy the last time when I should have found the original bolts but just reused the ones I had under the car with me.