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Talk => Speaking Of Bikes... => Topic started by: Nick Calne on April 05, 2020, 04:27:19 PM

Title: A question about your nuts...
Post by: Nick Calne on April 05, 2020, 04:27:19 PM
Well bolts actually... but now I have your attention...

Why on disc brake rotors do they install Allen head bolts to fix to the hub?

It seems every time a rotor has to come off the bolts are seized on with lock tite and brake heat. Trying to get the bolt out involves the risk of rounding the head. At least one of those tiny little surfaces gets rounded. Today it was 5 out of 12. Which, keeping on the nuts theme, was a bollock.

Why don't they use normal bolts you can get off with a socket?
Title: Re: A question about your nuts...
Post by: London_Phil on April 05, 2020, 05:38:45 PM
You need heat on the bolt to help break down the loctite, but even then its hit and miss.
I did my Steamer years ago, and used a heat gun to get the bolts hot, but I made sure I hade a top quality Allen hex on a socket, so I could put downward pressure whilst turning. (Wheel on floor, set between  some 4x2's.)
Still ruined a few, but at least they were out.
I think they are like they are for clearance, and aesthetics too.
Its all a labour of love, so keep calm, and carry on.....
Title: Re: A question about your nuts...
Post by: Timbox2 on April 05, 2020, 06:46:54 PM
I think KTM realises this which is why they use twin drive heads, torx and hex head in one, nifty
Title: Re: A question about your nuts...
Post by: London_Phil on April 05, 2020, 08:41:16 PM
We used to have those in Kodak Copiers from 20 plus hears ago... Damn good idea too
Title: Re: A question about your nuts...
Post by: Nick Calne on April 06, 2020, 05:20:58 PM
Thanks for the responses guys. So there would be nothing wrong with using a standard hex bolt then? Other than it might look a bit gash.

I think the one I have in mind is called a washer hex head.
Title: Re: A question about your nuts...
Post by: Timbox2 on April 07, 2020, 05:35:35 PM
Thanks for the responses guys. So there would be nothing wrong with using a standard hex bolt then? Other than it might look a bit gash.

I think the one I have in mind is called a washer hex head.

Flanged Hex is what I would call them: Similar to this?  With a dab of Loctite 232 (Medium)

 (https://i.ebayimg.com/images/g/2jYAAOSwYS5clnn8/s-l640.jpg)
Title: Re: A question about your nuts...
Post by: Nick Calne on April 08, 2020, 07:05:06 AM
That's them. I ordered some from Ebay.