What are the different grade's of metric bolts? I have one with a "9". on it

[GLENNWOOD55CAMEO]

I would like to know what the numbering system means on the Honda bolt heads. I have a metric bolt with the #9 showing on the head. I have an identical bolt, same size, that has #11 showing on the head. First of all, what does the 9 mean? Then what does the 11 mean? Or in otherwords what is the difference between the two?

 

[hotsos]

it doesnt matter whats marked on it, there are all different types of metric bolts, coarse, fine (3 types of fine) and "electric" fine which is even finer.

 

[GLENNWOOD55CAMEO]

But I have two bolts that are susposed to be the same but have different numbers on them. Just wondering if there is a difference and if so what would that be?

 

[killian101]

go get a bolt gauge from any home store...might be just a M9 bolt

 

[GLENNWOOD55CAMEO]

These are supposed to be hardened bolts for a special application.

 

[voch]

ahem...

MEtric fasteners are graded just like SAE fasteners
5.8 metric is equal to SAE 2
8.8 metric is equal to SAE 5
9.8 metric is equal to SAE 7
10.9 metric is equal to SAE 8
the higher the number, the higher the tensile strength. you can use the 10 in a 9 application, although you might want to check with the dealers parts department if it is a newer bike because it could very well have one time use torque to yeild "stretch" bolts.

voch