Are all bolts created equally?

[richardgr88]

Hi,

I need at one of these A0029900303 which I believe is an M6 bolt 27mm in length with an E8 for the ignition coils. Foolishly slightly sheered one off a bit. But they’re not available.

Is another Mercedes M6 bolt with an E8 head and 27mm or less up to the job in wondering? Anywhere else I’d probably chance it but as it is going into one of the engine covers not so keen to risk it and find out. I suppose what I’m asking is if and M6 thread in a Mercedes bolt is much the same as another Mercedes M6 bolt.

Many thanks in advance.
Richard

 

[Trickythemerc]

How do you slightly shear a bolt ? A sheep could be slightly or almost sheared, but a bolt is either sheared or it's not

 

[BigJase88]

Depends on the bolt tensile strength

4.8
8.8
10.9
12.9

The higher the tensile the stronger the bolt. However with higher tensile the bolt becomes more brittle

 

[richardgr88]

Thanks for the replies. Maybe sheared was the wrong word. Rounded is more suitable. Think I’m going to have to remove it careful with the E8/hex/multi point socket or grips. While it is out cut a channel across the top then in the absence of another bolt hopefully use a flat head to do it back up.

 

[Jobsworth]

Ignition coil is a non-critical fastner. The original grade is 8.8, but any bolt will do there

 

[oldguy57]

Thanks for the replies. Maybe sheared was the wrong word. Rounded is more suitable. Think I’m going to have to remove it careful with the E8/hex/multi point socket or grips. While it is out cut a channel across the top then in the absence of another bolt hopefully use a flat head to do it back up.

I've found that a multi point socket is not the best way of removing a rounded off bolt. 6 sided one is better. Ebay is your best bet for replacing the bolt - a couple of quid will buy several M6 bolts of the right length. No such thing really as a Mercedes bolt.

 

[grober]

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