Quote:
Originally Posted by aerobod
Metric bolts have a different grade system than imperial bolts. The minimum recommended grade for automotive use is 8.8, higher tensile bolts that are commonly available are 10.9 and 12.9.
BMW also use one-use stretch bolts, they may be used on the bracing bars, so just substituting a longer bolt without knowing it’s grade may not allow it to be tightened properly without the risk of it breaking.
Here is a typical primer on bolt head markings: https://henrysautowarehouse.com/bolt...h-identifiers/ |
Thanks for the detailed information.
After searching in 5 different hardware and Autoparts store, I found the M12 -1.50 is the right fastner which threaded perfectly. I forgot to pay attention to the tensile strength. I will make sure its 8 or above if I ended up needing it. My buddy and me working on the driveway without a full lift, may take 1 more weekend before we fully assemble and test it.