DO NOT bother with MB genuine nuts and bolts

[Big_Richard]

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[TJ 450]

So they're not even zinc plated? What a waste of time... are there any markings on the bolts, such as manufacturers?

Tim

[Big_Richard]

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[mirafioriman]

Use stainless! If you are buying them a few at a time the cost is negligable and they won't rust! PS You can always spray them black if the originals were and you want them to match!

[Big_Richard]

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[CraigS]

And another reason why I buy the majority of my screws and bolts in Germany. Of course, it helps that I am there reasonably often, but the selection is fantastic, and you can get the "correct" type. Price is also considerably cheaper as well. One example. The screws that hold the chassis plate on are EUR 0.62 each from the dealer in Germany. From the company I use, EUR 0.022 each. Is that profitering or what !

[Niclas]

Particularly the black ones, they are unprotected and start to rust immediately when exposed to outside air. 4 of these style are now the current part numbers for the 6.9 water pump, and the 4 screws for the thermostat housing cap. Piss poor MB, Piss poor.

Here in Australia we have access to zinc plated or galvanised bolts and washers of all sizes made locally which are of superior quality. I will not be ordering any more external nuts and bolts from MB if i can source them locally. if not, they will be additionally galvanised or cadmium plated.

Hi Patric,
black bolts are often hardened to 12.9 quality and can not be hot dip galvanized (not electro galvanized either I think) because of the heat destroys the hardening.
Normaly the highest quality of hot dip galvanised is 8.8 which gives a yield strength of 640 MPa. This is to be compared with the yield stregth of 12.9 bolts; 1080 MPa.
The torque stated for bolts often use 70% of their yield stregth, so if you use 8.8 bolts you are probably damn close to overload them f you tighten them to the specs.

/Niclas

[TJ 450]

I received my bolts from the dealer recently. Two of them were black class 10.9, the rest were class 8.8 galvanised and one zinc plated. The washers were also hot dip galvanised. I'm actually quite impressed so far.

Tim

[s class]

Does anyone know if zinc plating affects the strength of the bolts at all?