Proper B*****KS moment , Rounded UDH bolt , cant remover hanger ?

Tried removing said UDH hanger with good allen keys, clockwise (left hand thread)and its rounded the hex out, Tight as hell !, Any ideas how to get the bolt out ? , cant use things like easy out extractors as its a left hand thread ?

Tried grabbing it with pipe grips and cant budge it

I’ve ordered a 10 mm tap to see if I can tap a thread into it to remove with a bolt etc the correct way

or maybe Dremel it out ? .. any ideas appreciated

I did something similar.

Have you looked at the other side. Some axles  are double ended to get you out of this.

Mine wasn’t. I used an oversized bit and hammered it in IIRC.

Park Tool T bar allen keys have an oversized specially shaped bit on one end for this purpose. Can you get hold of one of those?

Drill it out. From looking at pictures the larger hanger piece has a sleeve that is inserted into the hole in the frame which the bolt then bolts into. Slowly increase the drill size until you get to the outside diameter of the bolts threads. At that point the bolt head should come off and the hanger can be removed. You should be way of the drill touching the actual frame. Buy a new hanger (and marvel at silca who seen to think their universal hanger is so much better is worth £80 ?).

I’d just drill it out.

With it being a LHT it’ll have the advantage of if the drill snags it’ll undo the thread.

As said above there’s plenty of metal in the hanger before the drill bit will get any where near the frame.

The other option is to dremel some wrench flats on the sides OR cut a line for a large screwdriver or metal plate lever (eg chainring bolt tool) to engage in.

I did something similarly to Nixie, I sacrificed a counter sink bit and machined away the bolt material until it dropped apart. Didn’t touch the frame

Putting flats on the bolt is an option if you have sufficient material but I would be wary of too much leverage.

Soak in plusgas or similar or WD-40

Grease the replacement parts on assembly

Next size up Torx bit hammered into the UDH bolt and an impact driver. Might even work without the driver.

*requires care, gentle touch and depends on access but one old school solution was, Using a sharp punch or small sharp chisel can you make an indent in the outside of the bolt (go straight in to make an indent) once you have the indent made reangle the punch/chisel so when you tap it you are tapping the bolt in the undo direction using the indent for grip. Beware of modern lightweight metals etc etc

Park Tool T bar allen keys have an oversized specially shaped bit on one end for this purpose. Can you get hold of one of those?

Won’t work on a left hand thread.

So I’ve been through a slightly different version of this. When I overtightened it the hanger bit snapped off and the remainder rotated in the bearing  pushing it through just pushed the bearing out of the frame.

Solution was surprisingly simple. I put a hacksaw blade through the middle of the bolt, attached it to the saw and cut through the bolt, then did the same on the opposite side.  I was doing it in a vice but you might be able be able to do the same with it fitted.  After 2nd cut bolt came out and bearing was unmarked

much safer by hand than trying to drill or dremel  (not sure how you get a dremel anywhere useful anyway)

Happy Days ?… I got it out …. tfft !!

Drilled out to biggest I’ve got 13mm ,still no good so went rummaging through my old tool box and found a curved pair of mole grips and managed to get enough purchase around the outside of the bolt , slowly turning in correct rotation and hey presto ,it came loose ,so so relieved , thankfully frames not touched, happy to say new hanger attached ?

Thanks for all the help … First frame with a UDH and what a nitemare!

Cheers

Great news! Such a nice relief when you get it out without damage

Why are they left hand thread? There’s no rotating components to loosen them off. Recipe for disaster.

because the axle screws into it from the other side so would loosen over time

Why are they left hand thread?

Shit design. Or being deliberately awkward? Problem is, we’re going to be stuck with it. There are brands trying to “fix” the weak points of the UDH design… but then they’re not really UDH, so are unlikely to take off.

because the axle screws into it from the other side so would loosen over time

Ah right , I can see it now from the photos. Thanks.