Rotor screw dimensions?

[Monastie]

whats the dimensions of the rotor screw?
gotta buy a new one since im going to brake mine off, its stuck

any1 got an idea?

[gale]

Oops, nevermind. I misread the post

[Chris'91'525i]

whats the dimensions of the rotor screw?
gotta buy a new one since im going to brake mine off, its stuck,
any1 got an idea?

http://www.realoem.com/bmw/showparts.do?model=HD13&mospid=47408&btnr=34_0025&hg=34&fg=05

I guessed at your production date (8/91) on realoem.com.
It's M8/12 or 14 (8mm diameter) by either 12mm or 14mm long for the front rotor, or a M8/12 for the rear rotor.

Your local ACE hardware has a good selection of single metric fasteners in those yellow parts boxes.

[Chris'91'525i]

whats the dimensions of the rotor screw?
gotta buy a new one since im going to brake mine off, its stuck
any1 got an idea?

Use a 3/8" drive socket type Allen wrench to remove.
You can usually break it free by tapping it with a hammer first to send a vibration through the fastener, before turning it out with the ratchet.
If that don't work, just use a sharp drill bit and drill the head of fastener off. Remove the rotor and whats left of screw should screw off by hand or pliers.