Thread size - AM4x8?

[Dave]

ahh more questions...

See attached picture, unfortunately the tank has had a bump and the previous owner used body filler to fix the dent. In doing so he filled in the emblem mounting holes!!

My plan is to use a tap drill to remove most the filler then run the appropriate tap into the hole.

The Parts Catalogue PDF from here suggest a M4x8 screw which is easy but the BMW Mobile Tradition electronic parts catalogue states that the screw is an AM4x8.

My question is I have never seen the "AM" prefix to a screw size, any thoughts as to what the "A" stands for?

Thanks, Dave.

[Dave]

[Kiwi-Kai]

Hi Dave

It is a CSK head (with a rounded head!), 8 mm long brass screw - M4 / pitch 0.7

AM?? A = alt (old) don't know maybe a printing error 

Kai

[Heiko]

Hi,

don´t know it exactly, but i think, BMW used a different headtype with another diameter of the head in the 50´s and 60´s...

Maybe Rolf knows the answer... Rolf: Help! 

Heiko "U(nsafe") 

[Kiwi-Kai]

Hi Dave,
Are u from Oz or what? Round the corner

Kai Kiwi

[rolf]

Sorry, I also don't know the function of "A", maybe a (new) internal sign for "dull-plated"?
Or really a printing error.
Rolf H(elpless)

[Dave]

Thanks chaps,

I ran the tap drill for an M4 thread and then used a bottoming tap to clear the threads. All worked perfectly, as Rolf suggested the "A" prefix is a modern thing I suspect.

Kai, yep. I'm up in sunny Brisbane. Please send rain

Cheers, Dave.