BILITOOLS M5 x 0.8 Thread Repair Kit, HSS Drill Helicoil Repair Kit

This kit is excellent. Drill, tap and installation tools work well and are good quality. Zero complaints here.

I would buy from this seller again!

I used this to repair threads in a mild steel piece. I wondered a bit, particularly about the insertion tool, based upon other reviews. I am happy to report it worked great. I had no issue at all with any of the parts including the insertion tool. I think others may have had problems because the included tap is a normal tap and will not tap the entire hole unless you can let the tap extend beyond the workpiece hole. If you are working on a non-through hole then you'd like to have a bottoming tap which the kit does not include. But for a hole completely through with a little space beyond the hole for the tap it works great. And the price is very reasonable. If you try to thread the insert into an incompletely tapped hole you will have problems with insertion. I think your best option would be to stop trying to insert the insert at that point and grind off any portion sticking out. My other tip is to put a little red locktite on the insert before you put it in.

I got hit by a cab while ridding my bike and the result was a snapped screw in my rack mount. I switched to my lower rack mount, but another accident resulted in that mount getting stripped. On a recommendation from an online bike repair forum I gave an M5x0.8 Thread Repair Kit a try. I'm happy to report, it totally works. The snapped bolt hole turned out a little janky due to having to drill out the bolt, but the stripped hole turned out perfect. I'm using 10/32 bolts but with such a short insert I can't even notice the difference in pitch. Would 100% recommend this kit for fixing your bike's stripped rack mounts! Everything worked flawlessly first try. You will need a good tap wrench and an electric drill, and I would recommend some WD40 when tapping your threads. Just go smooth and carefully and it'll tap a steel frame bike without much trouble (I got a tap wrench at my local hardware store for $15 and it was a must have for this job).

I bought the M5 version and tried it out on a test piece of aluminum. Have done helicoils many times. At least in this M5 size, the product cannot work and should not be sold. It is unreturnable since I tried it out?! The main reason for this opinion is that the tap cannot work for this application. It has no initial flare to get the threading started. The more expensive option have proper flares (just compare product images to confirm for yourself) and I will buy one of those, but not from Amazon as I lost money here. If I had done this on the actual part I am repairing, it would have been ruined. And of course that is not covered either. The terrible tap also produces a barely recognizable thread for the hellicoil. If you try to use that, the tang will break off. Amazon please stop the sale of this item, people will lose money on it and ruin their parts. It will also harm the reputation on Amazon as the customer cannot get a refund for a product they try out that turns out to be unfit for use. The m12 tap shown in the Bilitool product images shows a flare and that variation may function (or not). The image I share shows the different tap concepts...my Bilitools M5 sample is even more sudden than a bottom tap (top of that image). We'd want more like the lower part of that image - see the gradual flare? HTH someone.