How to remove rounded disc bolts?

Pubert

hey all,
recently i managed to fall off my bike and dislocate my shoulder, i also have bent my back hydrolic disk. it isn't too bad damaged but i thought i might be able to take it off and bend it back but as i was doing so i found 4 out of the 6 nuts holding on are rounded off at the ends so i can't get them out. any suggestions on what to do?

cheers,
Hugh

nicklouse

cut slots in the tops. and use a screw driver.

hit a larger tool into the top of the bolts and try that.

drill the tops off.

try mole grips.

cjw

If the worse come to the worse you can use a stud removal set or tap and die. I recently had an allen bolt head shear off and used these http://www.altecweb.com/home.asp?cat=Subcategory5+Piece+Screw+Extractor+Set to remove it.

Splasher

Presumably you don't mean nuts you mean screws. From Nick's list I'd recommend mole grips if the screws are cap heads (like hope use), and sawing slots if dome heads, only use an impact driver rather than a plain screwdriver.

cjw

Splasher wrote:

Presumably you don't mean nuts you mean screws. From Nick's list I'd recommend mole grips if the screws are cap heads (like hope use), and sawing slots if dome heads, only use an impact driver rather than a plain screwdriver.

Surely they would be allen bolts and probably not enough to get hold of with pliers etc ? Cutting slots may work but I found last time I tried that (not on a bike) the cut wasn't strong enough and had to tap them out.

nicklouse

mole grips does work. cutting slots does work. i have done both.

with the mole grips fileing a flat on two sides of the bolt can help.

toasty

Do you mean the torx disk rotor bolts? Bloody hate those things, one thing worth mentioning, use a good tool. I ebayed 2 in the past, both rounded, half knackered the bolts too as they'd slip, insanely hard to get pressure on. When I bought a good tool I was able to get out the ones I'd almost given up hope on as well.

I'd go for the screwdriver method personally if they were properly stuck.

Splasher

cjw wrote:

Surely they would be allen bolts and probably not enough to get hold of with pliers etc ? Cutting slots may work but I found last time I tried that (not on a bike) the cut wasn't strong enough and had to tap them out.

No they will be allen screws or torx screws. Bolts have a length of plain shaft, screws are threaded all the way to the head.

cjw

Splasher wrote:

cjw wrote:

Surely they would be allen bolts and probably not enough to get hold of with pliers etc ? Cutting slots may work but I found last time I tried that (not on a bike) the cut wasn't strong enough and had to tap them out.

No they will be allen screws or torx screws. Bolts have a length of plain shaft, screws are threaded all the way to the head.

They seem to call them bolts here; http://www.wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5300005194&N=M:Part%20Torx%20Rotor%20Mount%20Kit

nicklouse

Splasher wrote:

cjw wrote:

Surely they would be allen bolts and probably not enough to get hold of with pliers etc ? Cutting slots may work but I found last time I tried that (not on a bike) the cut wasn't strong enough and had to tap them out.

No they will be allen screws or torx screws. Bolts have a length of plain shaft, screws are threaded all the way to the head.

almost correct.

Cap screw. or machine scrw.

bolts are to be used with a nut.

but that is just being pedantic.

cjw

Actually there is no common screw or bolt usage;

Try this "The correct definition of bolt and screw is as follows.

Bolts are defined as headed fasteners having external threads that meet an exacting, uniform bolt thread specification (such as M, MJ, UN, UNR, and UNJ) such that they can accept a nontapered nut. Screws are defined as headed, externally-threaded fasteners that do not meet the above definition of bolts."


http://euler9.tripod.com/bolt-database/boltdef.html

Splasher

cjw wrote:

Actually there is no common screw or bolt usage;

Try this "The correct definition of bolt and screw is as follows.

Bolts are defined as headed fasteners having external threads that meet an exacting, uniform bolt thread specification (such as M, MJ, UN, UNR, and UNJ) such that they can accept a nontapered nut. Screws are defined as headed, externally-threaded fasteners that do not meet the above definition of bolts."


http://euler9.tripod.com/bolt-database/boltdef.html

So you admit you were wrong to call the fasteners holding the rotor on bolts

nicklouse

cjw


i like that definition. i just wish people would stop calling bolts nuts!

cjw

LOL, now if Pubert can only get them out!

cjw

Splasher wrote:

cjw wrote:

Actually there is no common screw or bolt usage;


So you admit you were wrong to call the fasteners holding the rotor on bolts

No, I'll still stick with bolt as they have exacting spec and can accept a nut, it just that the 'nut' is tapped into the hub. Although saying that screws can have an exacting spec as well

Splasher

nicklouse wrote:

cjw


i like that definition. i just wish people would stop calling bolts nuts!

Or in this case SCREWs nuts!

cjw

Or Scrolts!

Splasher

Nah, scrolts are people who nick bikes