Question about single use bolts

Danlnyc88 · 10-16-2022, 10:16 PM

Does anybody know what else on the car besides caliper bolts are used 1 time?

icegrill · 10-16-2022, 10:22 PM

Word on the street is charge pipe bolts.

:

G35POPPEDMYCHERRY · 10-17-2022, 09:52 AM

head bolts

NYG · 10-17-2022, 10:29 AM

Anything that is torque to yield.

So whatever you torque down that causes enough stress for the bolt to fail elastically and permanently elongate can only be used once.

jfritz27 · 10-17-2022, 10:43 AM

Of things that have reasonable chance of needing changing over the lifetime of the car, the bolts that hold the bearing/hub to the knuckle are in that category.

Oh, and the crank hub bolt

bigj505 · 10-17-2022, 09:30 PM

I want to say the carbon brace.
Bmw sales guy said the system was trying to have me buy them when I was getting spark plugs.

BzsBimmer · 10-17-2022, 10:24 PM

Quote:

Originally Posted by bigj505

I want to say the carbon brace.
Bmw sales guy said the system was trying to have me buy them when I was getting spark plugs.

Edit. It’s not the carbon brace, it’s the metal brace to the bulkhead or firewall.
home diy’s rarely do.

Grandeur · 10-17-2022, 10:27 PM

Quote:

Originally Posted by bigj505

I want to say the carbon brace.
Bmw sales guy said the system was trying to have me buy them when I was getting spark plugs.

From my understanding, I don't believe the bolts for the carbon brace itself are for one-time use. I think the only two that you replace when changing out spark plugs are the ones that secure the strut brace.
(Part Ref # 31127855855 & 31106854219)

BzsBimmer · 10-17-2022, 10:50 PM

^ correction… Yes the ones that go to the bulkhead. Those are tty 51 61 15AZ

bigj505 · 10-18-2022, 07:00 AM

Thx guys. I had purchased the bolts but the guy that did the spark plugs for me was able to do it without taking the brace off and didn't use the bolts. Im not privy to all the details so I just figured it was for the brace itself.

It wasn't just 2 bolts tho. I want to say I purchased a handful of them.

jmciver · 10-18-2022, 05:13 PM

For the OP, there are a crap ton of one-time use fasteners (nuts and bolts) on this car. Pretty much anything to do with the suspension, transmission, differential and drive shaft, just to name a few components.

10-16-2022, 10:16 PM	#1
Danlnyc88 Captain 442 Rep 626 Posts Drives: 2020 M4 Comp, 2017 Macan Turbo Join Date: Jun 2019 Location: Orange County iTrader: (1)	Question about single use bolts Does anybody know what else on the car besides caliper bolts are used 1 time?
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10-16-2022, 10:22 PM	#2
icegrill Lieutenant Colonel 2081 Rep 1,781 Posts Drives: 2015 M3 Join Date: Jan 2018 Location: Oregon iTrader: (3)	Word on the street is charge pipe bolts. :
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10-17-2022, 09:52 AM	#3
G35POPPEDMYCHERRY Banned 4999 Rep 4,139 Posts Drives: F80 Join Date: Dec 2015 Location: Philadelphia iTrader: (1)	head bolts
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10-17-2022, 10:29 AM	#4
NYG Brigadier General 10915 Rep 3,745 Posts Drives: Audi R8 Join Date: Feb 2017 Location: Brooklyn, NY iTrader: (0)	Anything that is torque to yield. So whatever you torque down that causes enough stress for the bolt to fail elastically and permanently elongate can only be used once.
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10-17-2022, 10:43 AM	#5
jfritz27 Major 1127 Rep 1,319 Posts Drives: 2018 F80 CS Join Date: Dec 2014 Location: New Jersey iTrader: (0)	Of things that have reasonable chance of needing changing over the lifetime of the car, the bolts that hold the bearing/hub to the knuckle are in that category. Oh, and the crank hub bolt
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10-17-2022, 09:30 PM	#6
bigj505 Captain 360 Rep 622 Posts Drives: 2016 BMW M4 Join Date: May 2011 Location: Baltimore,MD iTrader: (3)	I want to say the carbon brace. Bmw sales guy said the system was trying to have me buy them when I was getting spark plugs.
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10-17-2022, 10:50 PM	#9
BzsBimmer Major General 3290 Rep 6,732 Posts Drives: '23 G80 FO M3, M3 & MY Tezzy's Join Date: Mar 2006 Location: Nor. Cal iTrader: (32)	^ correction… Yes the ones that go to the bulkhead. Those are tty 51 61 15AZ
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10-18-2022, 07:00 AM	#10
bigj505 Captain 360 Rep 622 Posts Drives: 2016 BMW M4 Join Date: May 2011 Location: Baltimore,MD iTrader: (3)	Thx guys. I had purchased the bolts but the guy that did the spark plugs for me was able to do it without taking the brace off and didn't use the bolts. Im not privy to all the details so I just figured it was for the brace itself. It wasn't just 2 bolts tho. I want to say I purchased a handful of them.
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10-18-2022, 05:13 PM	#11
jmciver ///M SubDriver 1844 Rep 2,787 Posts Drives: 2017 M3, 2020 X7 40i Join Date: Jul 2016 Location: DMV iTrader: (0) Garage List 2017 BMW M3 [10.00] 2020 BMW X7 [0.00] 2019 BMW X3 [0.00] 2009 BMW 128i [0.00]	For the OP, there are a crap ton of one-time use fasteners (nuts and bolts) on this car. Pretty much anything to do with the suspension, transmission, differential and drive shaft, just to name a few components. __________________ ///M3 *COMPETITION 6MT* - 2017 F80 Smoked Topaz Metallic BM3 / MP-HAS / GC Camber Plates / Carbonstructure Interior X7 XDrive 40i ///M-SPORT - 2020 G07 Arctic Grey Metallic X3 XDrive 30i - 2019 G01 Mineral White (wife's) / 128i 6MT - 2009 E82 Jet Black (son's)
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