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subframe bolts...fine or coarse?

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I need to install a Helicoil in the left upper and left lower bolt holes on the frame. The upper was the PO's fault...the lower was mine :banghead:

 

I know the upper is M8x1.25, and the lower is M10x1.25. But how do I tell if they are coarse or fine?

 

PS-  For those who saw my other thread, the top end job is complete (except for these two bolts). Runs great  :ride:

Edited by tripleup05

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it's not course or fine like sae bolts,  they are a 1.25 pitch

 

That's what I was thinking, but Amazon had both fine and coarse listed for M8 and M10, so I was confused. 

 

Ofcourse, what's Amazon know about thread repair? lol

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your screwed  LOL

 

here is what I found  the 8x1.25 is course   a 8x1  would be fine

 

the 10x1.25 is fine  vs the  10x 1.50 is course  

that made no sense to me  LOL   but many sites verify

http://www.metrication.com/engineering/threads.html

 

course http://www.efunda.com/designstandards/screws/screwm_coarse.cfm

 

fine http://www.efunda.com/designstandards/screws/screwm_fine.cfm

 

 

 

                                                                                                                         

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Edited by Zimman

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Ofcourse, what's Amazon know about thread repair? lol

apparently more than all three of us  LOL  I had no idea either

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if you buy one of those little 10 buck boxes of machined head flange bolts used on most Japanese dirt bikes it'll likely have that size. Plus you have some spares.

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find someone who can tig aluminum. Have the holes welded shut, drill and retap for the oem bolts.

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