Grade 8 VS. class 10.9 bolts

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92CHB

Senior Member
I need to get some bolts for my turbo project and i was wondering if Class 10.9(i think thats the number) bolts are equivalent to grade 8 bolts? :shrug2:
 
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:
 
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:
[post=493617]Quoted post[/post]​


OUCH! :eek:
 
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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