Can you stack helicoils

I have used helicoils inline to get strong threads in soft materials polyethylene that can withstand more torque and much more wear than the plastic could have held up to. I'll second the Timeserts for going down a thread size, but they're expensive, especially the "installation kit". The counterbore sold with the kit is a bit of a joke. You'll quickly remove teeth from the counterbore if you're not consistently perpendicular to the bore and turning with constant force.

I had to c'bore the last 8 holes with a single tooth, but that was in an aluminum engine block and the car has done 40,km since. If you use two helicoils to get a longer grip they can't get 'out of sync' because they are both held in same thread. That's not a worry. There is no way to stack Heli coils inside each other. But, why?? Helicoil calls them twinserts. They're intended to restore an oversize STI tapped hole, and yes, one insert is installed inside another.

Originally Posted by Gordon B. Thanks, between you guys and some local input I am going to use just one. I just need a little holding force and one coil should be fine. With my newfound knowledge I am ready to attack it, should be hard to screw up. Any thread engagement over 6 threads course or fine is essentially doing nothing. Really the first three are doing the work. You'll need to log in to post. Log in. Login Digital Edition Buy a Subscription. Forums » Grassroots Motorsports » Helicoil Info.

Remember to use the correct matching tap, they are matched to the insert. In reply to Dr. Hess : That sounds reasonable, I haven't opened the package yet and it does not appear there are any instructions. What I remember from the machinery handbook. Log in. Forgot password or user name? Helicoil question. Posts Latest Activity Photos. Page of 3. Filtered by:. Previous 1 2 3 template Next. Helicoil question , AM. I want to remember you can "gang" Helicoils to give a deeper thread i.

Am I remembering correctly? Tags: None. John Stevenson. Yes but why? Oct 16, Joined Apr 11, Messages 2, Location Midwest. Has anyone got into trouble with indexing thread leads when trying to use two short Heli-Coils to fix a strip out, when you didn't have a long one? I've got two thread repaired holes, one that will only allow the screw to go in half way, the other lined up great and will accept the the bolt fine.

I believe most the inserts come in either x1. Click to expand Tzed Addicted to ArboristSite. Heli-coils are too hard for a tap to cut well. A thread system reaches near max strength at 1. Husq ArboristSite Operative. Joined Aug 18, Messages Location Iowa. Ive done it a few times in alum on deep holes without ever having an issue.

Oct 17, CM76 Addicted to ArboristSite. Tzed said:. Thanks for the insights, and yes the bind is where the tail was broken from the top second insert. Seems like if you could dress that area off, it would allow the top one to wind in further and align with the bottom insert. TheRickster ArboristSite Operative. Take a Dremel tool with a small stone and reach in and deburr the end of the first coil inserted..