90Q removing bolt from rear diff mount.

[Andrée-Anne Bourgeois]

>>j.d.larson at verizon.net writes:
>>
>>Tom said:  "Thanks, but I did check. They are grade 8's."
>>That "8" 0r "8.8" on the bolt doesn't mean "grade 8".  They're closer to
>>5s. Metric bolts aren't graded like US hardware.  You need a "10.9" or
>>better in this application.  They should have told you that.  But then,
>>they're typical retail parts counter men, and they probably didn't know
>>that.  BTW, John Deere and Caterpillar dealers are generally great places
>>to buy metric hardware, and I have found the counter men  to be both
>>knowledgeable and helpful.  HTH, John 
>> 
>
>Good point. I am familiar with the markings for American bolts, but I have 
>never really familiarized myself with metric bolt markings.
>
>Tom Faust


Tom, in the same vein, I had to replace the subframe bushings (and bolts) on
my urQuattro. Bolts were needed because they are supposed to be of the
"stretch-to-yield" variety, meaning single use. 

I bought some graded generic bolts from my Audi dealer (these were found in
the bolt cabinet, not in the OEM parts shelves), just to discover that they
were too soft; when I torqued them, there was not much resistance felt at
the torque wrench. Hum...

Then, I ordered true OEM bolts at 4.54$ each, and it became clear; these are
really high-grade fasteners, I clearly felt the difference at the business
end of the t-wrench.

Louis-Alain
1983 Quattro