Are single use bolts typically difficult to thread by hand?

mattssi · 11-19-2021, 04:42 PM

Just curious as I get started on my AST install.

I purchased 2 new bolts and nuts from the dealer for the rear shock/control arm mount since they are TTY/Single Use.

I started to thread the nut on the bolt just to make sure they fit and only got a thread or two on with my hands. I could thread more using a socket on each end, but it definitely wasn't smooth.

Is this a property of these types of fasteners and the means by which they get their larger "clamping force"?

Trying to learn here. Either that or I'm very weak or have the wrong combo of hardware.

mattssi · 11-23-2021, 11:36 AM

Answer is yes. When I removed the factory ones they were nearly impossible to thread by hand as well.

mrrm3 · 11-24-2021, 02:55 PM

Please post the part nos. for the bolts and nuts.

Many thanks.

mattssi · 11-24-2021, 03:41 PM

Bolt: 07119905610
Nut: 33326760668

mrrm3 · 11-29-2021, 04:20 PM

Danke !

iqstick · 11-30-2021, 02:32 PM

It's because the nut is an all metal locking nut. If you look at the top of the nut, it is probably an oval shape or there is a punch in the top of the nut to distort the thread. It doesn't have anything to do with them being single use.

mattssi · 11-30-2021, 03:01 PM

Quote:

Originally Posted by iqstick

It's because the nut is an all metal locking nut. If you look at the top of the nut, it is probably an oval shape or there is a punch in the top of the nut to distort the thread. It doesn't have anything to do with them being single use.

Nice, I'll have to look at that. Thanks.

11-19-2021, 04:42 PM	#1
mattssi Major 875 Rep 1,369 Posts Drives: 2019 X3 Join Date: Sep 2006 Location: Bend, OR iTrader: (1)	Are single use bolts typically difficult to thread by hand? Just curious as I get started on my AST install. I purchased 2 new bolts and nuts from the dealer for the rear shock/control arm mount since they are TTY/Single Use. I started to thread the nut on the bolt just to make sure they fit and only got a thread or two on with my hands. I could thread more using a socket on each end, but it definitely wasn't smooth. Is this a property of these types of fasteners and the means by which they get their larger "clamping force"? Trying to learn here. Either that or I'm very weak or have the wrong combo of hardware. __________________ 2021 ///M3 2019 X3 Last edited by mattssi; 11-19-2021 at 06:19 PM..
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11-23-2021, 11:36 AM	#2
mattssi Major 875 Rep 1,369 Posts Drives: 2019 X3 Join Date: Sep 2006 Location: Bend, OR iTrader: (1)	Answer is yes. When I removed the factory ones they were nearly impossible to thread by hand as well. __________________ 2021 ///M3 2019 X3
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11-24-2021, 02:55 PM	#3
mrrm3 Second Lieutenant 125 Rep 212 Posts Drives: 2022 M4 Join Date: Mar 2008 Location: Santa Monica, CA iTrader: (0)	Please post the part nos. for the bolts and nuts. Many thanks.
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11-24-2021, 03:41 PM	#4
mattssi Major 875 Rep 1,369 Posts Drives: 2019 X3 Join Date: Sep 2006 Location: Bend, OR iTrader: (1)	Bolt: 07119905610 Nut: 33326760668 __________________ 2021 ///M3 2019 X3
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11-29-2021, 04:20 PM	#5
mrrm3 Second Lieutenant 125 Rep 212 Posts Drives: 2022 M4 Join Date: Mar 2008 Location: Santa Monica, CA iTrader: (0)	Danke !
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11-30-2021, 02:32 PM	#6
iqstick Private First Class 140 Rep 198 Posts Drives: 2022 M3 Competition Join Date: Jun 2020 Location: Orange County, CA iTrader: (0)	It's because the nut is an all metal locking nut. If you look at the top of the nut, it is probably an oval shape or there is a punch in the top of the nut to distort the thread. It doesn't have anything to do with them being single use. __________________ 2022 M3 Competition Brooklyn Grey/Full Fiona Red- Build Week 50
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