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Brake calliper torx screws 2010 model
Posted: Fri May 24, 2019 11:02 am
by davef1uk
Hi all
Did research into what size etc, pulled up parts diagram from BMW.
Anyhow, said I needed M8 x 30 torx screws. But upon replacing the rusty ones, they are actually M8 x 40.
They screw in about 12mm. Would they be safe to use or would you advice getting the 40mm ones?
Cheers
Re: Brake calliper torx screws 2010 model
Posted: Fri May 24, 2019 12:51 pm
by Rod
Sounds like you've got just over 50% of the engagement you should have, buy the 40mm ones. Caliper mounts seem an area to play safe. Don't forget the correct grade, I've no idea what they should be 8.8??
Re: Brake calliper torx screws 2010 model
Posted: Fri May 24, 2019 1:58 pm
by milleplod
RealOEM shows 30mm bolts, and that's what I'd be using - it might not be 'safe' to assume that the removed 40mm ones are correct!
Pete
Re: Brake calliper torx screws 2010 model
Posted: Fri May 24, 2019 3:56 pm
by David.
TORX BOLT - M8X30-10.9-SI
Re: Brake calliper torx screws 2010 model
Posted: Fri May 24, 2019 4:49 pm
by simbo
Yep, definitely 30mm, I've just checked on my 2011.
Re: Brake calliper torx screws 2010 model
Posted: Thu May 30, 2019 4:11 am
by davef1uk
Thanks guys.
I was curious why mine had 40mm. Also my old ones have a stop thread about 12mm from end.
Thanks for confirming they are 30mm. So they just seem to screw in 12mm.
I have no idea about grade, where can I find the grade from?
Re: Brake calliper torx screws 2010 model
Posted: Thu May 30, 2019 7:44 am
by milleplod
As per David's reply above, the correct bolts are 10.9-SI. The 10.9 is the spec relating to the strength of the bolt, and I think SI just means that '10.9' is measured using an international system of units.
If in doubt, buy the genuine bolts from BMW....they'll be absolutely 100% the right ones!
Pete
Re: Brake calliper torx screws 2010 model
Posted: Thu May 30, 2019 7:58 am
by davef1uk
Ahhh that clears it up. Thanks All. Much appreciated