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View Full Version : Talk to me about helicoils



4thgenceli
04-06-2010, 02:48 AM
I've never used one..

From what I read, they come in the size I need. If the bolt is a M10x1.25, the helicoil kit will be a m10x1.25.

Now, say I have a hole that is bigger, can I use them to downsize them?

For example, I have a hole that's M12x1.5, and I want to use a M10x1.25 bolt, do these kits provide the ability to do that? do I need to use a M12x1.5 and bolt to match?

Nitro_Alltrac
04-06-2010, 03:12 AM
I used them to fix the holes in the head for my exhaust manifold. The set that I got from NAPA came with a drill bit and tap slightly larger than the original hole. Drill the hole then run the tap through,then use the tool to insert the helicoil. It worked good.

I don't think they will work for what you're wanting to do (12M to 10M hole) at least not the standard type. They're not quite that big. There are some other insert solutions out there that might work for what you're wanting to do but they are on the pricey side. I checked into them before using the helicoils.

Somebody chime in though if I'm way off base.

GT4SOM
04-06-2010, 04:28 AM
I don't see why not. You're wanting to go down 1 size right? I would have to check the kit I bought when my exhaust mani stud hole stripped. I think the only problem you're going to run into is the fact that you want to do a different pitch.

If you're hole is originally m12 x1.5, you can probably just insert helicoil for m10 x 1.5. I think the only way for you to get the m10 x 1.25 would be to drill out the m12 x1.5 hole and retap that hole using a specific kit for m10 x1.25 but I don't know if they make a "oversized" helicoil. Usually these kits are designed to keep the hole the same size. Read this http://www.helicoil.in/pdf/HeliCoil%20Catalogue.pdf Page 16 and 17.

I could be wrong.

joe's gt
04-06-2010, 04:42 AM
I can tell you about them.....Expensive as F*ck!

But I did fix an exhaust manifold stud with one and its been holding fine ever since.

donteatbugs
04-06-2010, 06:00 AM
they are rubbish, i can tell you that. what you really want is a time sert

http://www.timesert.com/html/bigsert.html

KoreanJoey
04-06-2010, 06:05 AM
Yes, timeserts are mucho better.

4thgenceli
04-06-2010, 06:15 AM
And mucho more $$$.

Looks like I can just buy the inserts though, I have drill bits & shit already for the rest.

david in germany
04-06-2010, 07:40 AM
This is the kind you want
Threadserts I think is what they are called. Talk to alltracman78, he got them for me when I needed them. After install I had 0 issues. Helicoil on the other hand will pull loose and your screwed (or unscrewed)
http://www.directindustry.com/prod/carr-lane/key-lock-threaded-insert-11751-412560.html

donteatbugs
04-08-2010, 04:22 AM
you can buy just the serts but they take a special tap and counter sink bit and seating tool to get them installed right. if you just needed the regular 10x1.25 kit i have it with about 10 inserts i could let you borrow it

i just checked a 12x1.5 nut and it threads in loosely. it might work if you dont have a stripped 12mm hole.

grayscale
04-08-2010, 11:21 AM
This is the kind you want
Threadserts I think is what they are called. Talk to alltracman78, he got them for me when I needed them. After install I had 0 issues. Helicoil on the other hand will pull loose and your screwed (or unscrewed)
http://www.directindustry.com/prod/carr-lane/key-lock-threaded-insert-11751-412560.html

Bingo- brand name is Keenserts. I've used them on all things industrial and automotive, can't be beat.

4thgenceli
04-09-2010, 04:22 PM
Off hand, anybody know what size drillbit & tap are used for the m10x1.25 helicoil kit? Curious if I already have the right size hole.

I took the m10x1.25 bolt I have, and it fit in the hole I drilled. Just eyeballing it, it looks like the m10x1.25 helicoil is will fill it out nicely, and allow the bolt to still grab & hold it in.