Thread Repair Using A HeliCoil Insert 

It's for repairing broken threads. When the internal thread is broken and cannot hold the bolt's thread, you put in a helicoil and your threaded hole is brand new again. Tipical usage is car/motorbike engine cases, where the thread hole's material is softer than the bolt's and thus an overtightened bolt can easily ruin the thread. With heli coil, you can use the same sized bolt again, without it, the only option would be to drill a larger whole and cut a new larger thread and use a bigger bolt.

This is the basic theory of a helicoil kit, and a very good one. This video has real applications but I have found scenarios where some of this won't work. It could highlight the overall process a bit more, which is: (1)drill (2)tap (3)helicoil installation. In short, you drill to make a new, clean hole size. Tap to cut in new, larger threads. Install a new coil, which creates new threads. Now you have a new internal thread for your bolt. Made out of steel, which could be better than the original. Thanks for the video!!!

Hi, i have M2,5 bolt and M2,5x0,5D helicoil: which thread tap and drill should i use? thanks

Excellent video, thanks. It is good to visualize the process

excellent video. thank you.

What size do you need to drill out the hole to get a 5/16 bolt in a Healy coil

This video is so helpful ive been installing helicoils without fully understanding whats going on and now i do and its glorious. thanks! also to other comments saying they are just for repairs, thats not totally true they are also useful if you have a soft metal part like aluminum but need to be able to screw bolts in and out repeatedly, since just aluminum threads will get messed up from that

I just needed this done on my engine today.

Hi There.... Would the insert be able to handle the torque specs??

good video,are there longer size inserts for lets say engine block repair?

Any ideas of repairing a radiator stripped plastic bleed screw?

I liked your instruction.

I'm a bit confused about how the helicoil grabs the threading of the product being repaired. Wouldn't you think that removing a bolt from the repaired product also result in the helicoil unscrewing from the product as well?

Can u make tutorial how to make that 3d :D

Super awesome video.

But you're going to tap out the hole after you've drilled out the old threads, what's the point of the helicoil?

Se ve muy interesante el video pero por favor podrian publicarlo en español tambien

good video

I don't understand why the heli-coil is even needed. What's a heli-coil doing that an ordinary threaded hole isn't?

. Are all helicoil inserts the same across all manufacturers meaning would the thread cut to take an M8 helicoil for example be suitable for any other make of insert?