subframe bolts...fine or coarse?

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

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

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

you don't have an ace hardware  or similar with a good golt and nut selection ? 

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

 

 

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

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

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.

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

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