Brake calliper torx screws 2010 model

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davef1uk
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Brake calliper torx screws 2010 model

Post 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
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Rod
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Re: Brake calliper torx screws 2010 model

Post 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??
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milleplod
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Re: Brake calliper torx screws 2010 model

Post 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!
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David.
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Re: Brake calliper torx screws 2010 model

Post by David. »

TORX BOLT - M8X30-10.9-SI

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Last edited by David. on Fri May 24, 2019 4:04 pm, edited 1 time in total.
simbo
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Re: Brake calliper torx screws 2010 model

Post by simbo »

Yep, definitely 30mm, I've just checked on my 2011.
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davef1uk
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Re: Brake calliper torx screws 2010 model

Post 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? 
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milleplod
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Re: Brake calliper torx screws 2010 model

Post 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
Last edited by milleplod on Thu May 30, 2019 7:46 am, edited 1 time in total.
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davef1uk
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Re: Brake calliper torx screws 2010 model

Post by davef1uk »

Ahhh that clears it up. Thanks All.  Much appreciated
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