I want to install a bolt into a stripped thread. I'm going to use a
helacoil. I don't have the install kit, but I have the helacoil
inserts. I don't ever have to take these bolts out again. My plan is
to drill out the hole, rethread it to the same thread as the outside of
the helacoil. Then put locktite on the outside of the helacoil insert,
then just drive the bolt in.
1: Will this work?
2: Any other pointers would help, also, any problems I might encounter
3: I've never used these. so any advice you guys can offer would be
4: Remember< i never want this bolt to come out
If it's a one-of-a-kind fix, i.e., not a matched set of threads like for
I wouldn't even bother with the helicoil; simply drill out the hole to
accommodate an 80% thread size & tap it for a slightly larger bolt.
Install the bolt with as much thread locker you like.
Dumb question..... Is this bolt fastening something ?? If so, how much
of the bolt is required for the something and how much of the bolt will
go into the hole ??? Heli-coils are not that long. So if the something
like a thermostat housing, is being installed..you need to plan for the
thickness...in this case it's easier to sink the heli-coil first.
otoh..if the distance is minimal, just tap for the helicoil, attach it to
the bolt with some locktite and drive it in., '
Now one really last downside... heli-coils are springs and if the tapped
hole is not perfect, the heli coil MIGHT self destruct as it goes into the
hole.... ie the coils might expand and it might not go in all the way. Using
loctite between the bolt AND the heli-coil (let it dry) will prevent this from
Make sure to thread the hole, using
oil and backing off the tap every so often to clean out the shavings.
First poster had a good point, if you can go up to the next size,
this would be easier than a heli coil.
All in all, it's pretty easy to do either way.....don't sweat the small
Go buy the proper helicoil kit. For the repair to work properly the
helicoil is installed under compression. The tap cuts a thread that is
designed to compress the insert and line up the coils so the internal
diameter will be correct. The installer is designed to grab the tang at
the end of the coil and draw it tighter to compress it enough to fit
into the hole and once installed breaks the tang off. If you tap to the
same thread as the coil the bolt will probably fall into the hole
without much effort.
Depending on what you are attempting to bolt down I would NOT want a
bolt that could not be removed at a later date. Wear and breakage both
have a hand in that.
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