Quote:
Originally Posted by pram133
Thank You. Yes I will keep that in mind. I got a longer Bolt like 1/2 inch more but I will check for Grade. Which grade is better on bolts.. Grade 6 or 8.. sorry not familiar with this.
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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/