[magic77]

Just wondering if anyone has purchased these / used them and can recommend a good reliable supplier.


I think its the McGard part no: 27178 if I recall correctly.

thanks

[G82Dude]

Think they are 27179SUB? And get the black ones! M12x1.50. Bound to be some on eBay...

[doughboy]

The BMW parts department locking nut sets are pukka Mcgards, only about 30quid from a dealers, same or less than from a regular mcgard shop.

Nice BMW box and importantly they are black like the rest of the bolts..

http://www.realoem.com/bmw/showparts...32&hg=36&fg=25

[magic77]

thanks will drop Anneka an email and get set ordered

[F31-340i]

Originally Posted by doughboy

The BMW parts department locking nut sets are pukka Mcgards, only about 30quid from a dealers, same or less than from a regular mcgard shop.

Nice BMW box and importantly they are black like the rest of the bolts..

http://www.realoem.com/bmw/showparts...32&hg=36&fg=25

+1

I can recommend them but watch how much you torque them up - I started to worry I may have overdone it on one of mine when I swapped wheels the other day - no damage or drama in the end, but I had one of those - ooh 'I wonder if this is about to snap' moments.

[Billyray911]

You're probably aware but as and when you do get some,remember that they can snap if you over torque.
Mine are at 110nm,whereas my standard nuts are tightened to 120nm.

[The_Bear_Yid]

I don't know how much they've come on these days but they used to be not much good. I'd hear that there was a very easy way to get them off.

My point being is that if someone wants your wheels that much they get them.

[G82Dude]

They were about £30 from BMW - they are nearer £40 plus VAT now...

Tip: always put some copper slip round the nuts too when replacing them (locking or non-locking).

[creepy coupe]

My local Halfruad does them. I'd imagine all branches do?

[doughboy]

Halfords do stock them, but when I looked they didn't have any black ones.

The mcgard manual says the max torque is 90nm, whereas the other bolts have to be 120nm.

I was after replacing the standard splined locking bolts after one stripped, but BMW offered the Mcgards instead

[scottishpete]

I have a set but silver with 2 new keys if your interested

[Billyray911]

Originally Posted by doughboy

Halfords do stock them, but when I looked they didn't have any black ones.

The mcgard manual says the max torque is 90nm, whereas the other bolts have to be 120nm.

I was after replacing the standard splined locking bolts after one stripped, but BMW offered the Mcgards instead

Apologies if I've given duff info,I followed a lengthy thread on this site about torque settings.
Doughboy,due to what you've said,I have looked on the site,but can't find that definitive torque setting anywhere.
It just says tighten to the settings as supplied in your vehicles manual...
Can you pop a link up for me please as mine are at 110 at the mo and I'd prefer to get it right-cheers!

[Statler]

Yes watch the torque on wheel bolts. Given my experience last week stripping a locknut, it's not an easy thing to correct...

[rsmallwo]

I have these, got them from BMW dealer for £33 a year ago. Don't overtighten them, they do bend.......when i bent mine I managed to get them repalced under warranty, had to tell a porky that I'd used a torque wrench to 120nm (its 120 +/- 10% i believe) and they just bent too easy. I know do it properly and had no issues.

[Jon D]

Originally Posted by uke92dude

Tip: always put some copper slip round the nuts too when replacing them (locking or non-locking).

Lubricating any threaded fastener will effectively amplify the torque by a factor of 25 - 30% and is a common cause of failure.
BMW states 120 +/-10Nm for M12 wheel bolts and that is dry torque.

[BGM]

i have some, got them from halfords

[BigBanana]

Originally Posted by Jon D

Lubricating any threaded fastener will effectively amplify the torque by a factor of 25 - 30% and is a common cause of failure.
BMW states 120 +/-10Nm for M12 wheel bolts and that is dry torque.

Good call!

I'd never have thought about that....

[G82Dude]

Originally Posted by Jon D

Lubricating any threaded fastener will effectively amplify the torque by a factor of 25 - 30% and is a common cause of failure.
BMW states 120 +/-10Nm for M12 wheel bolts and that is dry torque.

Interestingly that's what a mechanic told me to do - never had an issue and the bolts have always come out with ease (locking and non-locking). Also a good idea to put some on the central hub - then the wheel doesn't weld itself to it. But each their own.

[Jon D]

Originally Posted by uke92dude

Interestingly that's what a mechanic told me to do - never had an issue and the bolts have always come out with ease (locking and non-locking). Also a good idea to put some on the central hub - then the wheel doesn't weld itself to it. But each their own.

No harm in a very thin film on the hub to wheel interface; however, caution should be exercised as excessive grease will centrifuge onto the disc, with obvious consequences.
As to the bolt threads, I reiterate that lubrication significantly amplifies the applied torque. This is not a matter of choice or conjecture, just a simple principle of physics and one that is often ignored by those who think they know better. That comment is definitely not directed at you, more at the mechanic who advised you. Nonetheless, as you say: each to their own.

[G82Dude]

Originally Posted by Jon D

No harm in a very As to the bolt threads, I reiterate that lubrication significantly amplifies the applied torque. This is not a matter of choice or conjecture, just a simple principle of physics and one that is often ignored by those who think they know better. That comment is definitely not directed at you, more at the mechanic who advised you. Nonetheless, as you say: each to their own.

Are you saying that the torque applied by the wrench is more easily acted upon and transferred to the shaft of the bolt, with the lubrication or that it in some way increases the actual torqued value of the bolt - I am a little confused?

[Jon D]

Originally Posted by uke92dude

Are you saying that the torque applied by the wrench is more easily acted upon and transferred to the shaft of the bolt, with the lubrication or that it in some way increases the actual torqued value of the bolt - I am a little confused?

Lubrication reduces friction, which allows the fastener to rotate further with a given torque value; in other words, it becomes easier to turn. The increased thread engagement results in the bolt stretching further than the design optimum, eventually going beyond it's elastic limit and failing.
The following is an extract from the 'Standard Aircraft Maintenance Handbook': "If a lubricant is used (for example, oil, grease, anti-sieze, Loc-Tite, etc.) a table for lubricated bolts must be used since any product that provides lubrication allows for more bolt stretch at a given torque setting, and may result in over-stretching or breaking the bolt."