Is McCulloch SM57 .354 Pitch?

[dsell]

Is McCulloch SM57 .354 Pitch? That's stamped on a 65370 McCulloch branded drum for a Pro Mac 10-10. I searched and found two hits here, but no answers.

 

[dsell]

Just found the answer in a 10-10 manual. Yes.

20 65370 1 Drum/Spkt Asy - 7T .354P
21 1 Sprocket - Fixed rim

 

[heimannm]

McCulloch .354 chain would be marked 350 or 358, Carlton .354 would be J1 (.050 gauge) or J2 (.058 gauge).

SM57 is .404 I believe. McCulloch changed their nomenclature a few times, if I have it straight the earlier SM chains were Super Mac, chipper or semi-chisel style cutters. Later on SM referred to Speed Mac but again was semi-chisel style chain.

This is from the 1977 bar and chain catalog. The SM57 branded chain was 15-20 years earlier.



65370 is the part number for the .354 Super Mac drum with a fix, rim type sprocket affixed to the drum.

Mark

 

[ray benson]

SM-57 .354 pitch .058 gauge. Listed on page 4 of a 1969-1970 Sabre chain bar catalog.

 

[dsell]

SM-57 .354 pitch .058 gauge. Listed on page 4 of a 1969-1970 Sabre chain bar catalog.

Thanks Ray, that nails it.

 

[heimannm]

As we were going through clutches and such today we came across several 65370 drums and they do indeed have SM57 stamped on them.

I will have to look as some of the older chains and parts I have as I am sure I've seen the SM and SP monikers used on older, bigger chain.

Mark

 

[heimannm]

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.



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.



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.





Mark

 

[dsell]

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.

View attachment 1057328

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.

View attachment 1057329

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.

View attachment 1057330

View attachment 1057331

Mark

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.

 

[heimannm]

The 3/8 LP does not quite fit the .354 rims. You could probably make a cut if you left the chain a little loose but it would tear up the drive links and the sprocket pretty quickly.





Just FWIW...

SM57 5.7/16 = .356 (.354) pitch

SM65 6.5/16 = .406 (.404) pitch

SM7 = 7/16" pitch

SM8 8/16 = 1/2" pitch

SM9 9/16 = 9/16" pitch

Mark