Quote:
Originally Posted by andrewwynn
I'm not even sure what BMW means by microencapsulated but I think it's a special treatment that distresses the metal "one time" to lock it. These bolts aren't.
I use an app called iEngineer to look up bolt stress/yield etc.
I think those bolts are M12 front axle maybe M10 back.
Over 5 tons of force at normal torque.
The spec torque for 10.9 M12 is 122 N·m. That is 75% of yield 160 ish should be yield hence "nowhere near". You can stress a steel bolt effectively ∞ times if below 75% of yield. It acts just like a spring.
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Just to be nerdy, I found some info regarding the yield of 160. Yield is stress with units of pressure like psi, torque is of unit length x force. So they can't be compared. Please have a look at the link below (the tables) and let me know what you think (I get yield of 940 and proof load of 630 MPa). This has become an interesting discussion.Thanks
https://www.boltdepot.com/fastener-i...ade-Chart.aspx