Brake calliper torx screws 2010 model

[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

[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??

[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

[David.]

TORX BOLT - M8X30-10.9-SI

[simbo]

Yep, definitely 30mm, I've just checked on my 2011.

[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? 

[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

[davef1uk]

Ahhh that clears it up. Thanks All.  Much appreciated