Brake Drum Markings

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markfh

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Is there somewhere to find what all the markings on brake drums meanin the 67-69 era? I know the part number and manufacture are on some but there are other markings that I can't figure out.
 
They will usually have the max diameter that the drum can be and still be safe to use.

The default for pass car drums used to be .060 over the listed size

You had to be careful, I've forgotten, there were some light truck sizes that were not "even inches"
 
These are the only markings on my drums. I got the part number and the manufacture but wanted to know what the other marks meant.

drum1.jpg


drum2.jpg


drum3.jpg


drum4.jpg


drum5.jpg
 
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