no it's not....and the guy at ace isn't a rocket scientist. lol

 

test fixtures at most hdwe stores are there because metric and usa are often similar. im just presenting the facts fron the measurement fixture that is there for that purpose.
if you want to believe that loose fitting 3/8 is right then just do it .
the 10 mm bolts that i bought match exactly with the ones i pulled out of my h3. you can do the same just pull an original and line the threads up and its simple to see,,no guesswork.
the 3,8 are close but are no match.
be careful when you get into a critical or expensive part. you could screw it up.

so im done , believe what makes u feel good

tom

 

well if the ace test fixtures says so....why didn't you say that to begin with? I plan to remove my nerf bars and crank my torsions anyways ROFL

 

Weird.... the 10mm that came with the kit wouldn't fit, even after I cleaned out the holes with a brush and some WD40 ..

The 3/8x16 went in smoothly, no binding at all..

 

you still better check the bolt at the Ace test board.....

 

drtom....I have one of those test fixtures you're referring to, http://www.mcmaster.com/#thread-checkers/=94ltri (page #2249 item #20375A21). That's how I determined the size. The thread 'pitch' of the M10 is 1.5mm. The thread 'pitch' of the 3/8" is 16 threads per inch, which when converted to metric, is 1.58mm. They are SO close, that when you mesh the threads from one to the other, they visually appear to be the same. The difference is in the dia., with the M10 being .0187" larger. A 3/8"x16 will thread into a M10x1.5 hole, but due to the larger dia., a M10 will NOT thread into a 3/8" hole. That's why these guys can't get the M10's that came with their nerfs to fit. Unless they changed the weld nut (the frame itself is NOT tapped), for 2010, (which I would bet the farm they didn't), An M10 won't fit in my '08, or apparently the other member's H3s.

 

For new words to say the same thing!!

I know,,,the 10 mm bolts that dont fit might be wrong pitch??

The 10mm bolts i pulled from my hummer are exactly the same as the ones i bought at ace/lowes. The hummer uses 10 mm bolts.
You can use the wrong size if you want to.

3/8 is indeed a nice loose fit. It could be good so they wont stick when rusted.
Ill try to post a pix of the 10 mm and 3/8 lined up to show clearly the difference for those mechanics who insist on using the proper fasteners.

Then again it might be that my h3 is a special metric version,,,ooops, that would mean my old 07, and my new 10 were specially made of metric parts!!!. Since i pulled the lowering brackets off the 07 and used the same bolts on the 2010. Oh whats a mother to do!!


The simple solution is, take a bolt out of your hummer. Take it to the store and tell the part time, minimum wage clerk you want some to match. The kid with the pimples will be sure you use the right parts!! Thats it!! OH IF THE KID ASKS HOW LONG YOU WANT THEM, BE SURE TO SAY "A LONG TIME,SINCE IM KEEPING MY HUMMER", OTHER WISE THEY ,MIGHT RUN THEM THRU THE RENTAL DEPT,,,

 

perfectly huh?!!
you can see they are ,,are??

top, h3 step bolt.10mm
bottom 3/8 inch
note the first 5 threads on right,how they touch first on one side then the other,later the peaks line up.
not a good match