either in most cases work great... I use a lot of helicoils..
Time certs will not work in some uses, must be counter sunk if the threaded item has another part on top of it. Like say a caliper that bolts behind a fork leg. Are difficult to use / trim in a case hole that drains fluid from that hole.

And I've never had an issue from a helicoil that was solved with a time cert... NEVER

 

Agreed that they both work well if done properly. I have seen issues with helicoils that were either done wrong or in a high use area from something that gets removed more regularly.

You will never fix an helicoil with a timesert because the hole would already be to big with the heli coil to install a timecert. The timecerts being a solid sleve just seem to have less installation issues and seem to be more reliable in that 1 in 100 times that the helicoil doesn't seem to work out.

 

Just a few common used sizes on bikes and cars I work on.

From both manufactures web site catalogs and engineering data (I use that many, I have both downloaded and on my desk top)
M6x1 Timecert Drill size d drill bit 0.246"
M6x1 Helicoil Drill size d drill bit 0.246"

M8x1 Timecert Drill size p drill bit or 0.323"
M8x1 Helicoil Drill size 21/64 or 0.3281"

saying you could remove one type and repair with the same size in the other brand is not correct. The drill size specified is BEFORE you tap the insert threads.. Once that is done for either brand, you can not go in with the other brand specified tap and run the hole again.. There would not be the materiel needed.

Im sure folks can install a Helicoil wrong... never seen it.. but I've seen folks install piston circlips with a hammer and screwdriver, install wheel bearings by pounding on the cone with a piece of pipe. and many other indicators or proof, that some folks shoud not own tools So Im sure your correct, some folks have poorly installed a Helicoil,, same folks would likely drill the wrong size hole for a timecert, drill it off angle, break the tap in the hole, not counter sink the top of the blind hole and flush the timecert when another part is required to be mounted flush with the top of the repaired part.

I do use Timecerts in some cases and think it is better product when used in those cases, for all others I like the helicoil better, Less expensive. more available if I have not prior planed and had enough of the size needed on hand, and they work perfectly in most cases.. for all others in goes a Timecert.


Thus ends my

 

M8x1 Timecert Drill size p drill bit or 0.323"
M8x1 Helicoil Drill size 21/64 or 0.3281"
Not trying to be a smartass but how many M8 x 1.0 threads do you run into? I'm pretty sure that you'll see about 10,000 M8 x 1.25 threads before you see one M8 x 1.0. Unless some engineer somewhere figured the 1.0 pitch was the hot ticket.

 

Thanks everyone. Timesert it is.

 

In the metric challenged part of the world, yes... Over here, it's probably 50/50, seeing as the smaller pitch has a few advantages in hydraulic applications...

 

So is the bolt 8X 1 or 1.25

 

On the brake calipers? If it's an M8 bolt there, it's 1.25...

 

Tweety, was just responding to the "And I've never had an issue from a helicoil that was solved with a time cert... NEVER" comment. Though you are 100% correct. Once tapped you'd likely not be able to go the other way.