On Thu, Sep 25, 2014 at 11:03 AM, John Miller <jem@milleredp.com> wrote:
> On 9/25/2014 7:49 AM, William Engle Sr wrote:
>>
>> 15 and 18 mm are used more in the US than the rest of the world.
>
>
> There's different standards on what size bolt head you get with a given size
> threaded shank.
>
> F'rinstance, a Japanese M8 bolt will be a 12mm head, but a Euro (or usually
> US) DIN M8 bolt will be a 13mm head and you'll pretty much never find
> anything that takes a 12mm socket on a German car.
>
> For some years Detroit, in particular, chose their metric fastener head
> sizes to be close enough to let you use SAE wrenches
There are also all the lovely 80s stuff that has metric heads and SAE
threads, to meet some silly contract requirement. I do not miss
working on that crap, at all.
For the original question, when I was running a shop w/ a quick lube
lane, which used cheap shop-owned tools, we used a tire crayon to
color in the etching, which worked fine, but wasn't terribly durable.
Wiping some model paint in the depressions would probably work great.
--
David Scheidt
dmscheidt@gmail.com
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