Thanks Ray, that nails it.SM-57 .354 pitch .058 gauge. Listed on page 4 of a 1969-1970 Sabre chain bar catalog.
Good info. Hopefully, the pictures will stick around for years to come. Have you tried .354 rims on 3/8LP? I have some .354 rims, that's why I'm asking.Here is where I went wrong in my thinking...the picture in my mind was SM7 which I confused with the SM57 stamp on the .354 clutch drums.
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I still don't find any .354 chain with the SM57 or even SM label anywhere.
The McCulloch .354 chain is stamped Pro cMc and the drivers 350 or 358 for .354/.050 and .354..058 respectively.
The Carlton is stamped J1 on the drivers for .354/.050, their .058 was stamped J2.
I also encountered this piece of Oregon in .354 with 45 stamped on the drivers.
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It is hard to tell from these photos without another chain in view for perspective, but the chassis of the .354 is the same height as most .404 chain. I don't know what they were trying to accomplish with that, perhaps it was just the make the .354 more distinguishable from standard 3/8 chain to try and reduce the problems with .354 chain on 3/8 sprockets and vice versa.
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Mark
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