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Toothed Bar, M=1, Z=10 Meaning
On a toothed bar, such as 4205760, I'm wondering what the M and Z stand for in the description.
I think the Z=10 might mean there are 10 high points along the bar. My guess is that the M=1 has something to do with the pitch or the depth of the ridges.
Can anyone confirm or deny either or both of these items?