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Self-locking nuts and bolts

6590 Views 9 Replies 7 Participants Last post by  503865
I've been working on my Benz, following the shop manual instructions. It seems that every bolt and nut is the self-locking variety, and available mainly through the dealer at exorbitant prices. To be honest, I had never heard of such beasts, so I did a little research. Actually, they do exist, and the science behind them is quite sound. Those Benz engineers do know what they are doing. Here is a very useful link, and video clip:

Vibration Loosening of Bolts and Threaded Fasteners

The article states that "...the chemical locking category provides the greatest resistance to vibration loosening...". Perhaps, hardware nuts and bolts with Loctite will do the trick?

Does anyone have any information on this?
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I use the blue thread locker for dozens of repairs so I can reuse the original fasteners.

Permatex now hos a gel formula that is much nicer to work with. It does not drip or run.
The axle bolts on most of the 4-Matic cars is also a stretch bolt. One time use only. They are only $9.

I saw somebody reuse on and it snapped as he was torquing it.
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