Originally posted by h82w8@May 1 2005, 09:49 AM all I know is I had a 4" long grade 10.9 bolt go through my brand new g-force ta installed 3 weeks prior :headsmash:
No they are not the same but very simular. Grade 8 is what the SAE came out with and grade 10.9 is the metric version. Grade 8 min tensile strenght is 150K PSI and 10.9 is 142.2K. Also the torque capacity of the grade 8 is higher then its metric conterpart.
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