Heli-Coil 5546-8 M8 x 1.25 Metric Coarse Thread Repair Kit

Used in front spindle of TJ to hold caliper. Worked perfectly

Excellent product for the 4 stripped out transmission fluid pan bolts on a 41AE/41TE A604 Transmission case. These 8 X1.25 X 16mm fasteners are steel mated to an aluminum transmission case and it does not take much to strip out threads. USes 31/63" drill but not included. I use a Cobalt Irwinn. For the application, I prefer these over Threadsert (besides some snapping in half or giving way at lower psi than the Helicoil as evidenced on Torque Test Channel on YT) They also are a cinch to install (maybe 4 min each) and also dont require drilling out any really large hole as some other makes or nut inserts. I only wished they came in a whole metric and SAE set

saved me bigtime stripped hole on reman engine

The kit (5546-8) is a special thread tap, a coil insertion tool, and a dozen 3/8" long stainless inserts. They assume you have the drill and tap handle (had the drill, a nice tap handle costs another $20). The tap in this kit is a through-hole style and not a bottoming tap that you might see in generic photos, so select your kit carefully. Though the contents of the kit come from a low-cost manufacturing country the quality is good and everything worked perfectly for the four inserts I installed. The tap generates lots of chips that pack the flutes, recommend hand tapping and backing off 1/4 turn for every turn of cut and pulling the tap every five or six threads to clean it out. I liked the security the big name brand brought to the repair - happy to spend the extra couple of bucks for cheap insurance when I'm spending a day upside down drilling out sheared bolts and fixing threads in an expensive assembly.

Made the mistake of using an impact driver on a bolt and stripped the threads on my crossmember. None of the shops around me wanted to touch it. This kit was surprisingly easy to use and saved me a lot of headache. Drilled out the old threads was easy since I wasn't making a new hole (bit sold separately). Be sure to use cutting oil when tapping. I backed out 1/4 to 1/2 turn for every 2 turns and really took my time. Once everything was installed it worked great!

I purchase this beacuase a Mechanic stripped the caliper bolt hole on my 1999 Jeep Cherokee Sport. He then told me I needed a a whole new spindle because of the stripped bolt whole which would cost hundreds on dollars in parts and labor. I want to tell anyone who needs to repair a stripped bolt hole that this product work great. I completed the job in under a hour, start to finish. Just keep in mind that in order to use this product I also had to purchase a 21/64 th drill bit to drill out the hole before repairing the threads for the helicoil to go into. You might also want to purchase a T handle designed to hold the the tap straight while making the new threads. Again this is a fast and easy way to repair threads and it will save you a small fortune in stead of paying a machanic a lot of money to do a 45 minute job.

I tossed around the idea of grabbing one of the lesser named "coil" kits, but with the job I was working on, I couldn't chance them not being dead on. I grabbed this kit along with the recommended Bosch drill bit and everything worked out perfectly. The Heli-Coil brand kit is definitely a high quality fix for important thread applications. The coils, tap, and installation tool worked out great. I was able to fix the problem I had first try. Now I have some spare coils and the cost was worth the peace of mind and knowing it's a precise and quality fix.

Much easier than I anticipated. If the kit included the drill bit it would eliminate finding one the right size. I chose this brand over the others that did include the drill bit because it's that important to do this job right the first time.