Exact Motorsports RCA Bolt Failure!!!
#76
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Bolt Grade and application
The issue for the broken bolts is most likely due to the selection of grade 12.9 NOT the torque, although the torque is also questionable. Grade 12.9 is never used by OEMs for anything other than engine heads or engine parts due to the high degree of brittleness in the 12.9. There is no reason why this application should be anything other than grade 10.9 max, look at most of your suspension components and you will see this is the case. A very brittle Bolt is the LAST thing you want in a suspension component that takes vibrations and flexes.
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BLKonBLK98
LS - 1st and 2nd Gen (1990-2000)
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10-11-09 05:12 PM