BILITOOLS M10x1.25 Thread Repair Kit, HSS Drill Helicoil Repair Kit Metric

i'm almost finished making a custom router table insert from a 3/8" thick aluminum plate. I have what I thought were the hard parts done: mounting bolt holes, the center bit hole and rabbet to hold some plexiglass zero clearance rings, etc. I planned to tap 8 holes for the starter pin locations -- four centered on the outside edge of all four sides about 3/4" from the edge, and four more in line with those 4, but 3/4" from the bit opening at the center of the plate.After breaking 3 of the 8 taps that came in a set from this site, I sent them back for a refund and bought a single-size drill bit and tap set for much less. That tapped the 4 outside edge holes perfectly.Unfortunately, 2 of the inside holes were slightly too big, because 2 broken taps had to be extracted with a punch and hammer. The final 1/4x20 tap was able to complete those 2, but they wound up looser than they should be The 3rd that broke was the 1/4x20 tap, and it remained in the plate. I was unable to pound it loose. My efforts to remove it also caused some minor damage around the hole.I ordered some diamond hole saw "bits" from this site, and managed to remove enough material around the stuck tap to punch it out. Whew!!Oh, the 4th inside hole was tapped okay except it was not perpendicular. The starter pin was at an angle when screwed in. Four out of four holes were messed up to varying degrees.I've never used the helicoil or any other thread repair product, but the reviews looked promising, and the process appeared simple enough.This helicoil kit arrived today, and I proceeded to repair all 4 holes. I first drilled them all while I had the drill bit from this lit in the drill press. I then tapped the holes using the drill press but turning the spindle by hand to hopefully keep the tap perpendicular to the plate.Between tapping each hole, I used a drill-driver on low speed to extract the tap from the plate, then cleaned and installed it into the press again. I used compressed air to clear out the newly tapped hole, and I followed the instructions to insert the helicoil and break off the pin.Installation succeeded without any problems. The helicoil inserts are almost exactly the same depth as the plate, so that's convenient.Now i have four freshly repaired, threaded holes around the bit opening. There's a very small damaged spot next to the one hole I had trouble extracting the 3rd broken tap from. I may try filling it in with the aluminum braising rods i just got for a different repair, but not right away. It's 99% cosmetic as far as i can tell. The starter pin screw works fine in it and sits perfectly perpendicular. That's what matters most.BTW, I was comfortable with the design of this product, because in woodworking, I use a lot of threaded barrel inserts for jigs and such. The Helicoil is basically a metalworking version of that wood-working fastener.i don't often need to repair stripped threads inside a bolt hole. However, the next time i do, i'll know what to use.

I used these on my VW Passat because they engineered the coil pack nuts poorly which result in threads being easily stripped. The drilling and installation went smooth and took less than 10 minutes for 4 bolts.

Snapped a few bolt off on my outboard motor. Drilled them out, threaded them, installed the helicoils and they held solid. No leaks, no problems. Just take care to drill perfectly straight.

I used it on an aluminum cylinder head. It worked fine but it would have not been as easy if I had been working with cast or steel due to the provided tools. Still it was good value for the money and with a little ingenuity I could make it work in any situation. I would buy again if I needed to.

I've been using thread repair tools for 40 years.Heli-coil was the best, and the only one for a long time.This brand is the beat that I have ever used.It comes with the correct size drill bit ( good quality).It has and easy to use installation tool.The tap tjat is included is high quality, very sharp, and it lines up easily to the hole being repaired.This is my preferred brand now.I have most of the common standard and metric sizes of kits.

I'm a long time Helicoil-brand user. Needed an M6 x 1.0 threaded insert kit quick and this one would arrive sooner than Helicoil brand, so I gave it a shot. Very pleased. No issues with any of it. I was repairing holes in a cast aluminum vehicle transmission case. I'll buy again in a different size in the future if the need arises. Also, price compared to genuine Helicoil brand is nice.

I wish I bought this years ago! No more cutting corners on iffy studs!The drill bits and taps seem very high quality. However, the tool used for inserting the coils it made of very soft metal and it gets bent up and disfigured with surprisingly little force so be super gently with them and have a file and screwdriver or something on hand to bend it back into shape..I'm sure most mechanics know this already, but when you insert it, it stretches. Since it is longer in-place than before make sure you account for that when checking the depth of your tap and go deep enough or else it will squish at the bottom and your fastener will get chewed up.

Delivered on time, quality product, complete kit, everything needed to repair damaged threads. Good instructions.

Very easy to use. I used WD-40 to assist with the cutting. Quality parts and includes everything you need

Buena herramienta he comprado de varias medidas para estar completo en mi taller y así no paro el trabajo y lo termino en tiempo y forma.

great product, did exactly what I needed it to do and is as described

nice repair kit good price good instructions

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