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Just trying to remove my disk rotors which are thred locked in, got to last one to find the nut is thredded and allen key just turns, any ideas on how to get it out?
though they were torq head?
cut a slot with hacksaw and screw it out?
2nd cut a slot with a hacksaw - if you put two blades in the saw you get a wider slot which might help in getting a decent screwdriver to fit
how will a screwdriver help a threaded bolt - rounded head yes, threaded bolt - no!
RR - I think both of us were translating the OP as meaning the head was rounded not that the thread had gone. Could be wrong - its not the clearest post on here
Assuming it is a rounded allen head screw, either cut a slot in the head (Dremel with a cut off wheel is better than a hacksaw) or you may be able to hammer in a slightly larger Torx bit.
screw extractors - we say it every time this question comes up and even halfords do them now. Also Screwfix or any number of tool shops - cost £5-10 quid depending on where you get them
My advice would be to use a screw extractor as a very last resort. A disc bolt is very small to drill into and a small screw extractor is easy to break.
Another method is to drill the head off and then the disc should come off allowing you to get a mole grip on the stub of the bolt.
Rounded allen bolt generally doesn't need drilling with the set I've got - try the one that's meant to go into a 5mm hole.
That said like TJ said when I can't find the screw extractors I just drill the head off with a drill bit slightly too large to go through the bolt hole on the disc. There's a distinctive feel when the head pops off and after the tension is released on the bolt it generally turns pretty easily with pilers and you have a mm or two proud of the hub (disc thickness basically) to get hold off. The heat from drilling seems to help too - whether it should or not I don't know.
It's aways when you try to unsrew rotor bolts that they round isn't it? Probably good given the properties of the threads in expensive aluminium hubs.